Break Apart / Make Ten (Addition)
Solve: 48 + 72 by making ten.
48 + 2 = 50, then 50 + 70 = 120
Solve: 149 + 96 by adding on.
149 + 1 = 150, then 150 + 95 = 245
Solve: 399 + 52 using compensation.
Shift 1 from 52 to make 400 + 51 = 451
Solve: 84 - 27 by removing 27 in parts.
27 in parts.84 - 20 = 64, then 64 - 7 = 57
Solve: 98 - 87 by adding up.
87 + 3 = 90, then 90 + 8 = 11
Solve: 387 + 28 by making ten.
387 + 3 = 390, then 390 + 25 = 415
Solve: 3,842 + 117 by adding on.
3,842 + 100 = 3,9422, then +10 = 3,952 + 7 = 3,959
Solve: 6,748 - 299 using compensation.
Shift 1 from 6,748 to make 6,749 - 300 = 6,449
Solve: 6,324 - 256 by removing 256 in parts.
6,324 - 200 = 6,124, then 6,124 - 50 = 6,074, then 6,074 - 6 = 6,068
Solve: 6,742 - 6,658 by adding up.
6,658 + 2 = 6,660, then 6,660 + 80 = 84
Solve: 6,894 + 59 by making ten.
6,894 + 6 = 6,900, then 6,900 + 53 = 6,953
Solve: 87,256 + 34 by adding on.
87,256 + 30 = 87,286, then 87,286 + 4 = 87,290
Solve: 89,452 + 399 using compensation.
Shift 1 from 89,452 to make 89,453 + 398 = 89,851
Solve: 132,879 - 4,756 by removing in parts.
132,879 - 4,000 = 128,879, then 128,879 - 700 = 128,179, then 128,179 - 56 = 128,123
Solve: 132,345 - 129,876 by adding up.
129,876 + 124 = 130,000, then 130,000 + 2,345 = 2,469
Solve: 128,764 + 47 by making ten.
128,764 + 6 = 128,770, then 128,770 + 41 = 128,811
Solve: 573,482 + 48 by adding on.
573,482 + 50 = 573,532, then 573,532 - 2 = 573,530
Solve: 257,832 - 4,999 using compensation.
Shift 1 from 4,999 to make 257,832 - 5,000, then add back 1 → 252,833
Solve: 984,365 - 378,125 by removing in parts.
984,365 - 300,000 = 684,365, then 684,365 - 70,000 = 614,365, then 614,365 - 8,125 = 606,240
Solve: 874,369 - 548,273 by adding up.
548,273 + 27 = 548,300, then 548,300 + 51,700 = 600,000, then 600,000 + 274,369 = 326,096
Solve: 1,239.7 + 198.9 using the make ten strategy.
1,239.7 + 0.3 = 1,240, then 1,240 + 199 = 1,439
Solve: 987,654.3 + 299.8 by adding on.
987,654.3 + 300 = 987,954.3, then subtract 0.2 → 987,954.1
Solve: 1,234,567.8 + 999.9 using compensation.
Shift 0.1 from 999.9 to make 1,234,567.9 + 999.8 = 1,235,567.7
Solve: 1,238,479.5 - 999,999.8 using removal.
Remove 1,000,000 first (1,238,479.5 - 1,000,000 = 238,479.5), then add back 0.2 → 238,479.7
Solve: 9,875,432.6 - 9,499,999.9 by adding up.
9,499,999.9 by adding up.9,499,999.9 + 0.1 = 9,500,000, then 9,500,000 + 375,432.6 = 375,432.7