Differences from 1000
Use rounding to estimate the answer to the subtraction
problem.
Check
878 - 539
???
510
330
110
600
170
430
150
270
340
488 - 322
???
510
330
110
600
170
430
150
270
340
468 - 139
???
510
330
110
600
170
430
150
270
340
803 - 197
???
510
330
110
600
170
430
150
270
340
502 - 73
???
510
330
110
600
170
430
150
270
340
702 - 549
???
510
330
110
600
170
430
150
270
340
683 - 169
???
510
330
110
600
170
430
150
270
340
901 - 789
???
510
330
110
600
170
430
150
270
340
576 - 239
???
510
330
110
600
170
430
150
270
340
719 - 451
???
510
330
110
600
170
430
150
270
340
Check
OK