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LESSON 2 Strategies for Making Tens
Switching Numbers
Do the following problems in your head. Switch the order of the numbers you add so that it is easier to make a ten. Switching the order of the addends does not change the sum. There may be more than one way to solve each problem. A sample has been done for you.
- 5 + 6 + 5 =
- 12 + 7 + 8 =
- 5 + 9 + 11 =
- 3 + 17 + 7 =
- 16 + 4 + 11 =
- 14 + 16 + 6 =
Breaking Addends into Parts
The numbers that are added in an addition problem are called
the addends. The answer is called the sum.
the addends. The answer is called the sum.
Find groups of ten in the following number sentences by breaking an addend into two parts. Then find the sum. There may be more than one way to solve each problem. Be ready to explain your thinking to the class.
- 16 + 6 + 2 =
- 5 + 12 + 7 =
- 14 + 8 + 1 =
- 13 + 2 + 9 =
- 14 + 12 + 4 =
- 22 + 16 + 5 =
