2nd graders have addition and subtraction story problems tonight. They need to read carefully to know which to do. They may draw pictures to represent the problem or use the "breaking numbers apart". For subtraction, it is easier to keep the first number together and break apart the second number.
Example:
35 - 12
35 - 10 = 25
25- 2 = 23
3rd graders are doing more with addition and using a number line strategy. They should use "landmark numbers" such as multiples of 10 or 100 on their number lines.
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