Multiple+Solution+Strategies


 * Multiple Solution Strategies

I t is important that students learn how to use multiple, or flexible, solution strategies so that they are better able to solve 2-digit and 3-digit addition and subtraction problems. Students may choose to use the following strategies: composing and decomposing numbers, unitizing , part-part-whole, or counting strategies to help them solve addition and subtraction problems. **


 * Example****

Composing and Decomposing for 35+42 30+40=70 5+2=7 70+7=77

Unitizing for 38+42 8 and 2 is one group of 10 30+40+10=80

Part-part-whole for 37-25 3 is made up of the parts 2 and 1, so I know that 3-2 must equal 1. 7 is made up of the parts 5 and 2, so I know that 7-5 must equal 2. I know that 37-25 must equal 12.

Counting on for 12+5 Student would say, "12, 13, 14, 15, 16, 17." Click here to return to the Top Ten Early Numeracy Skills.

References **