You can estimate to find out "about how many" when subtracting as well as when adding.
This is also called rounding.
You can estimate the differences of two-digit and three-digit numbers.
Look at the examples below.
77
Rounds to
80
31
Rounds to
- 30
50
The estimated difference of 77 - 31 is 50.
459
Rounds to
500
287
Rounds to
- 300
200
The estimated difference of 495 - 287 is 200.
Practice estimating the difference with two-digit and
three-digit numbers.
67
Rounds to
52
Rounds to
- 32
Rounds to
-
- 26
Rounds to
-
467
Rounds to
345
Rounds to
- 159
Rounds to
-
- 189
Rounds to
-
81
Rounds to
47
Rounds to
- 32
Rounds to
-
- 16
Rounds to
-
269
Rounds to
666
Rounds to
- 115
Rounds to
-
- 421
Rounds to
-
27
Rounds to
94
Rounds to
- 11
Rounds to
-
- 37
Rounds to
-
525
Rounds to
813
Rounds to
- 210
Rounds to
-
- 199
Rounds to
-
38
Rounds to
73
Rounds to
- 26
Rounds to
-
- 19
Rounds to
-
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