LI-Solve addition and subtraction problems by compensating with tidy numbers (including equal additions).
The number line activity was about exaplaining the answers for each of an equation with a number line and how to solve them using the add or subtract 10 method
The equations were 123 + 18, 228 – 19, 91 – 29, 596 – 89, 312 – 9, 991 + 88
If solvers has an hard eqaution use the add or subtract 10 method.
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