Mike Jacobs
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mikejacobs.bsky.social
Mike Jacobs
@mikejacobs.bsky.social
480 followers 50 following 760 posts
Math teacher in Ontario/Mountaineer/Munroist/Exiled Yorkshireman/Dad to two great kids.
Creator of Yohaku Puzzle https://www.yohaku.ca/
Author of Onwards and Upwards. https://tinyurl.com/OnwardsUpwardsHills .
#RunEveryDay
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mikejacobs.bsky.social
Here's a #yohaku to take you into the weekend. Fill in cells with 16 different factors of 660 to get totals shown in each row/column AND shaded cells contain triangle numbers. #mathsky #iTeachMath
Use 16 different factors of 660 in a 4 by 4 grid. The numbers in the top row add to 13. The numbers in the second row add to 160. The numbers in the third row add to 153. The numbers in the bottom row add to 47. The numbers in the left column add to 77. The numbers in the second column add to 28. The numbers in the third column add to 148. The numbers in the right column add to 120. The central four cells contain triangle numbers.
September 25, 2026 at 11:19 AM
mikejacobs.bsky.social
Try this shady #yohaku. Fill in cells with 9 different integers to get products shown in each row/column AND sum of 4 shaded cells is -8. #mathsky #iTeachMath
Use 9 different integers in a 3 by 3 grid. The numbers in the top row multiply to -125. The numbers in the middle row multiply to -27. The numbers in the bottom row multiply to -112. The numbers in the left column multiply to 90. The numbers in the middle column multiply to 525. The numbers in the right column multiply to -8. The sum of the integers in the 2 by 2 square at the top left of the grid is -8.
September 24, 2026 at 10:59 AM
mikejacobs.bsky.social
Start your day with this #yohaku. Fill in cells with 9 different factors of 510 to get totals shown in each row/column. #mathsky #iTeachMath
Use 9 different factors of 510 in a 3 by 3 grid. The numbers in the top row add to 120. The numbers in the middle row add to 66. The numbers in the bottom row add to 24. The numbers in the left column add to 46. The numbers in the middle column add to 25. The numbers in the right column add to 139.
September 23, 2026 at 11:13 AM
mikejacobs.bsky.social
"Start your day with this #yohaku. Fill in cells with 9 different whole numbers to get products shown in each row/column. More free puzzles and books/ebooks for all ages can be found at yohaku.ca
Use 9 different whole numbers in a 3 by 3 grid. The numbers in the top row multiply to 72. The numbers in the middle row multiply to 39. The numbers in the bottom row multiply to 385. The numbers in the left column multiply to 63. The numbers in the middle column multiply to 66. The numbers in the right column multiply to 260.
September 22, 2026 at 10:58 AM
mikejacobs.bsky.social
Start your week with this #yohaku. Fill in cells with 9 different factors of 460 to get totals shown in each row/column. #mathsky #iTeachMath
Use 9 different factors of 460 in a 3 by 3 grid. The numbers in the top row add to 29. The numbers in the middle row add to 122. The numbers in the bottom row add to 52. The numbers in the left column add to 71. The numbers in the middle column add to 35. The numbers in the right column add to 97.
September 21, 2026 at 11:11 AM
mikejacobs.bsky.social
Here's a #yohaku to take you into the weekend. Fill in cells with 16 different factors of 960 to get totals shown in each row/column AND shaded cells contain triangle numbers. #mathsky #iTeachMath
Use 16 different factors of 960 in a 4 by 4 grid. The numbers in the top row add to 11. The numbers in the second row add to 60. The numbers in the third row add to 239. The numbers in the bottom row add to 70. The numbers in the left column add to 26. The numbers in the second column add to 155. The numbers in the third column add to 38. The numbers in the right column add to 161. The central four cells contain triangle numbers.
September 18, 2026 at 11:20 AM
mikejacobs.bsky.social
Try this shady #yohaku. Fill in cells with 9 different integers to get products shown in each row/column AND sum of 4 shaded cells is -2. #mathsky #iTeachMath
Use 9 different integers in a 3 by 3 grid. The numbers in the top row multiply to -102. The numbers in the middle row multiply to -70. The numbers in the bottom row multiply to 143. The numbers in the left column multiply to -273. The numbers in the middle column multiply to 85. The numbers in the right column multiply to -44. The sum of the integers in the 2 by 2 square at the top left of the grid is -2.
September 17, 2026 at 11:13 AM
mikejacobs.bsky.social
Start your day with this #yohaku. Fill in cells with 9 different factors of 520 to get totals shown in each row/column. #mathsky #iTeachMath
Use 9 different factors of 520 in a 3 by 3 grid. The numbers in the top row add to 79. The numbers in the middle row add to 86. The numbers in the bottom row add to 116. The numbers in the left column add to 182. The numbers in the middle column add to 49. The numbers in the right column add to 50.
September 16, 2026 at 11:13 AM
mikejacobs.bsky.social
"Start your day with this #yohaku. Fill in cells with 9 different whole numbers to get products shown in each row/column. More free puzzles and books/ebooks for all ages can be found at yohaku.ca
Use 9 different whole numbers in a 3 by 3 grid. The numbers in the top row multiply to 54. The numbers in the middle row multiply to 70. The numbers in the bottom row multiply to 156. The numbers in the left column multiply to 168. The numbers in the middle column multiply to 65. The numbers in the right column multiply to 54.
September 15, 2026 at 11:08 AM
mikejacobs.bsky.social
Start your week with this #yohaku. Fill in cells with 9 different factors of 240 to get totals shown in each row/column. #mathsky #iTeachMath
Use 9 different factors of 240 in a 3 by 3 grid. The numbers in the top row add to 10. The numbers in the middle row add to 24. The numbers in the bottom row add to 72. The numbers in the left column add to 7. The numbers in the middle column add to 73. The numbers in the right column add to 26.
September 14, 2026 at 11:14 AM
mikejacobs.bsky.social
Here's a #yohaku to take you into the weekend. Fill in cells with 16 different factors of 840 to get totals shown in each row/column AND shaded cells contain triangle numbers. #mathsky #iTeachMath
Use 16 different factors of 840 in a 4 by 4 grid. The numbers in the top row add to 11. The numbers in the second row add to 360. The numbers in the third row add to 160. The numbers in the bottom row add to 41. The numbers in the left column add to 56. The numbers in the second column add to 166. The numbers in the third column add to 332. The numbers in the right column add to 18. The central four cells contain triangle numbers.
September 11, 2026 at 11:15 AM
mikejacobs.bsky.social
Try this shady #yohaku. Fill in cells with 9 different integers to get products shown in each row/column AND sum of 4 shaded cells is -3. #mathsky #iTeachMath
Use 9 different integers in a 3 by 3 grid. The numbers in the top row multiply to -78. The numbers in the middle row multiply to -28. The numbers in the bottom row multiply to -220. The numbers in the left column multiply to 154. The numbers in the middle column multiply to -52. The numbers in the right column multiply to 60. The sum of the integers in the 2 by 2 square at the top left of the grid is -3.
September 10, 2026 at 10:57 AM
mikejacobs.bsky.social
Start your day with this #yohaku. Fill in cells with 9 different factors of 750 to get totals shown in each row/column. #mathsky #iTeachMath
Use 9 different factors of 750 in a 3 by 3 grid. The numbers in the top row add to 82. The numbers in the middle row add to 32. The numbers in the bottom row add to 415. The numbers in the left column add to 386. The numbers in the middle column add to 57. The numbers in the right column add to 86.
September 9, 2026 at 11:10 AM
mikejacobs.bsky.social
Today saw the start of year 37 for me in teaching!
A n image of a whiteboard in a math classroom saying 'Welcome to MTH1W' and a variety of mathematical objects, graphs and diagrams.
September 9, 2026 at 1:26 AM
mikejacobs.bsky.social
"Start your day with this #yohaku. Fill in cells with 9 different whole numbers to get products shown in each row/column. More free puzzles and books/ebooks for all ages can be found at yohaku.ca
Use 9 different whole numbers in a 3 by 3 grid. The numbers in the top row multiply to 42. The numbers in the middle row multiply to 105. The numbers in the bottom row multiply to 396. The numbers in the left column multiply to 420. The numbers in the middle column multiply to 154. The numbers in the right column multiply to 27.
September 8, 2026 at 11:14 AM
mikejacobs.bsky.social
Start your week with this #yohaku. Fill in cells with 9 different factors of 567 to get totals shown in each row/column. #mathsky #iTeachMath
Use 9 different factors of 567 in a 3 by 3 grid. The numbers in the top row add to 51. The numbers in the middle row add to 151. The numbers in the bottom row add to 199. The numbers in the left column add to 199. The numbers in the middle column add to 111. The numbers in the right column add to 91.
September 7, 2026 at 12:54 PM
mikejacobs.bsky.social
Here's a #yohaku to take you into the weekend. Fill in cells with 16 different factors of 990 to get totals shown in each row/column AND shaded cells contain triangle numbers. #mathsky #iTeachMath
Use 16 different factors of 990 in a 4 by 4 grid. The numbers in the top row add to 25. The numbers in the second row add to 149. The numbers in the third row add to 93. The numbers in the bottom row add to 64. The numbers in the left column add to 12. The numbers in the second column add to 91. The numbers in the third column add to 153. The numbers in the right column add to 75. The central four cells contain triangle numbers.
September 4, 2026 at 1:16 PM
mikejacobs.bsky.social
Try this shady #yohaku. Fill in cells with 9 different integers to get products shown in each row/column AND sum of 4 shaded cells is -4. #mathsky #iTeachMath
Use 9 different integers in a 3 by 3 grid. The numbers in the top row multiply to 153. The numbers in the middle row multiply to 80. The numbers in the bottom row multiply to -88. The numbers in the left column multiply to 272. The numbers in the middle column multiply to 66. The numbers in the right column multiply to -60. The sum of the integers in the 2 by 2 square at the top left of the grid is -4.
September 3, 2026 at 11:58 AM
mikejacobs.bsky.social
Start your day with this #yohaku. Fill in cells with 9 different factors of 510 to get totals shown in each row/column. #mathsky #iTeachMath
Use 9 different factors of 510 in a 3 by 3 grid. The numbers in the top row add to 39. The numbers in the middle row add to 22. The numbers in the bottom row add to 205. The numbers in the left column add to 202. The numbers in the middle column add to 45. The numbers in the right column add to 19.
September 2, 2026 at 12:08 PM
mikejacobs.bsky.social
Start your day with this #yohaku. Fill in cells with 9 different whole numbers to get products shown in each row/column.
More free puzzles and books/ebooks for all ages can be found at yohaku.ca
Use 9 different whole numbers in a 3 by 3 grid. The numbers in the top row multiply to 42. The numbers in the middle row multiply to 110. The numbers in the bottom row multiply to 252. The numbers in the left column multiply to 112. The numbers in the middle column multiply to 231. The numbers in the right column multiply to 45.
September 1, 2026 at 12:29 PM
mikejacobs.bsky.social
Start your week with this #yohaku. Fill in cells with 9 different factors of 570 to get totals shown in each row/column. #mathsky #iTeachMath
Use 9 different factors of 570 in a 3 by 3 grid. The numbers in the top row add to 111. The numbers in the middle row add to 23. The numbers in the bottom row add to 22. The numbers in the left column add to 24. The numbers in the middle column add to 16. The numbers in the right column add to 116.
August 31, 2026 at 1:28 PM
mikejacobs.bsky.social
Here's a #yohaku to take you into the weekend. Fill in cells with 16 different factors of 624 to get totals shown in each row/column AND shaded cells contain triangle numbers. #mathsky #iTeachMath
Use 16 different factors of 624 in a 4 by 4 grid. The numbers in the top row add to 91. The numbers in the second row add to 211. The numbers in the third row add to 237. The numbers in the bottom row add to 27. The numbers in the left column add to 312. The numbers in the second column add to 112. The numbers in the third column add to 18. The numbers in the right column add to 124. The central four cells contain triangle numbers.
August 28, 2026 at 1:35 PM
mikejacobs.bsky.social
Try this shady #yohaku. Fill in cells with 9 different integers to get products shown in each row/column AND sum of 4 shaded cells is -5. #mathsky #iTeachMath
Use 9 different integers in a 3 by 3 grid. The numbers in the top row multiply to -66. The numbers in the middle row multiply to -28. The numbers in the bottom row multiply to 130. The numbers in the left column multiply to 60. The numbers in the middle column multiply to 154. The numbers in the right column multiply to 26. The sum of the integers in the 2 by 2 square at the top left of the grid is -5.
August 27, 2026 at 2:15 PM
mikejacobs.bsky.social
Start your day with this #yohaku. Fill in cells with 9 different factors of 210 to get totals shown in each row/column. #mathsky #iTeachMath
Use 9 different factors of 210 in a 3 by 3 grid. The numbers in the top row add to 14. The numbers in the middle row add to 42. The numbers in the bottom row add to 119. The numbers in the left column add to 115. The numbers in the middle column add to 50. The numbers in the right column add to 10.
August 26, 2026 at 12:19 PM
mikejacobs.bsky.social
Start your day with this #yohaku. Fill in cells with 9 different whole numbers to get products shown in each row/column.
More free puzzles and books/ebooks for all ages can be found at yohaku.ca
Use 9 different whole numbers in a 3 by 3 grid. The numbers in the top row multiply to 102. The numbers in the middle row multiply to 264. The numbers in the bottom row multiply to 65. The numbers in the left column multiply to 510. The numbers in the middle column multiply to 429. The numbers in the right column multiply to 8.
August 25, 2026 at 1:14 PM