#DotAddition
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inv3math.bsky.social
His partner tells me "I would use 3 5s."

Me: I agree, 3 5's would make 15. But there are no 5's left. 🤷🏼‍♀️

Him: (staring/glaring at the remaining cards)

Me: What if you start with 3 and 2?

The light bulb pops & he pulls out two more sets of 2+3.

#DotAddition #FirstGrade #MTBoS #ITeachMath
March 15, 2025 at 3:17 PM
inv3math.bsky.social
This student needed to make 15. He took 2 5's and a 4 and counted on from 10 to 14. He sighed and told me, "There are no 1s. It would be great if there was a 5."

Me: It would be nice but you already used it. Do you know another way to make a 5?

#DotAddition #FirstGrade #MTBoS #ITeachMath
March 15, 2025 at 3:17 PM
inv3math.bsky.social
How would you make 12 from 2s, 3s, 4s, and 5s? Can you find two different ways? #DotAddition #FirstGrade #MTBoS #ITeachMath
A recording sheet has rows for ways to make 9, 12, 12, and 15. In the first row, a pair has written 5 + 4= 9 and drawn dot images of 5 + 4 = 9. Next to the sheet are cards with dot images for 5, 5, and 2, and in the first of the rows for 12 they have written 5+5+2=12. To the right there is an array of 5x4 cards. The cards show dot images for 2, 3, 4 or 5, and some are missing. One the left, there is a recording sheet with rows for ways to make 9, 12, 12, and 15. In the first row, a pair has written 5 + 4= 9 and in the second row they have written 5+5+2=10. Next to the sheet are cards with dot images for 3, 2, 2, and 5.
March 15, 2025 at 3:06 PM