15 February 2019
Walt: choose an efficient way to solve addition and subtraction problems.
A. 224 + 366 =
200 + 400 =
600 + 24 =
624 - 34 =
590
B. 458 - 233 =
458 - 200 =
258 - 30 =
228 - 3 =
225
C. 2157 + 314 =
2200 + 300 =
2500 + 14 =
2514 - 43 =
2471
D. 2482 - 630 =
630 + 70 =
700 + 1782 = 2482
70 + 1782 =
1852
E. 2360 + 270 =
2360 + 300 =
2660 - 30 =
2630
F. 5480 + 358 =
5480 + 400 =
5880 - 42 =
5838
G. 7831 - 472 =
472 + 28 = 500
500 + 7331 = 7831
28 + 7331 =
7359
H. 3842 + 952 =
3800 + 1000 =
4800 + 42 =
4842 - 48 =
4794
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