Estimating Differences

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.

The estimated difference of 77 - 31 is 50.

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	-