We've been practicing a strategy called Think Ten in our Number Corner time. When you are adding to a number that is close to ten (7, 8, or 9 plus something), it can help to think how many more you need to make ten and imagine taking that many from one number. This flexible thinking is called composing and decomposing numbers. Then what you are left with is an Add Ten fact (ten and some more) and that is easier for most of us to solve. For example, instead of counting on to find the sum of 8 + 6, a student could imagine moving 2 from the 6 to make the 8 a 10 and then it would be the same as 10 + 4, or 14.
Here we are using two colors of Unifix cubes to represent the two addends. We put some of the second number on the tens frame to complete the ten and then saw the two quantities differently, as ten and more. We also practiced just imagining this in our heads with tens frames, and doing it with magnetic tiles. We made and read equivalent expressions such as 7 + 4 = 10 + 1.
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