Subtraction math game

 We played a fun subtraction math game today. One partner spun a number from mat A and one from mat B. Then we wrote the subtraction problem on our whiteboard and the person who got the answer first got a tally. We played for 15 minutes and when Mrs. Suther rang the bell the person with the most tallies won the game! It was a great way to practice our subtraction strategies!

Duncan and Theo

Hope and Ryan

Kyla and Vivienne

Jake and Hayden

Emily and Hunter

William N and Camden

Zoe and Alexis

We spun an 11 and a 6 ~ this is our sentence!

Nice work Vivienne!

I would like to give a quick overview of this week's subtraction strategy.
When solving the problem 15-3 we have learned to make 15 into 10 and 5.
Then we ask can we subtract 3 ones from 5 ones. Yes we can, so that leaves 2 ones.
We then add the 2 plus 10 and our answer is 12. So 15-3=12.
When solving the problem 15-6 we know to make 15 into 10 and 5.
Then we ask can we subtract 6 ones from 5 ones. No. So that means we need to subtract the
6 ones from the 10 leaving 4 ones. We then add the 4 plus 5 and our answer is 9.
So 15-6=9.
All of this prepares us for more difficult problems involving regrouping!
As always if you have any questions please email me. Thanks for your help!

Standard 1.OA.C.6

Operations & Algebraic Thinking

Add and subtract within 20.

6. Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

Play IXL for extra practice