Subtract 3998 from 4003 mentally.
3
Toby notices these numbers are close to each other. He counts up from the smaller number to the larger number.
+ 1
+ 1
+ 1
+ 1
+ 1
3 998 3 999 4 000 4 001 4 002 4 003
Complete the following mentally. (a) 780 − 180 =
(b) 3000 + 2500 =
(c) 990 − 4700 =
(d) 893 − 543 =
(e) 5700 + 1200 =
(f) 660 + 220 =
(g) 726 − 321 =
(h) 6400 + 4400 =
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