We Are learning to Choose an efficient way to solve addition and Subtraction problems. For Example:
Place Value
2360 + 270
300 + 200 = 500
60 + 70 = 130
500 + 130 = 630
plus 2000 = 2630
Compensate
26+ 66
26 + 4 = 30
66 + 4 = 70
100 - 8 = 92
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