Adding it Up
Going Down
Guesstimate
Carrying Down
Times it Up
100
209,239 + 219,244
428,483
100
800,000 - 439,399
360,601
100
Estimate the sum 5,456 + 2,999
8,000
100
256 / 8
32
100
34 x 83
2,822
200
883,392 + 232,004
1,115,396
200
500,000 - 399,999
100,001
200
Estimate the difference 9,499 - 4,999
4,000
200
873 / 3
291
200
823 x 992
816,416
300
2,993,992 + 894,399
3,888,391
300
876,543 - 234,567
641,976
300
Estimate the product 387 X 6
2,400
300
955 / 4
238 r 3
300
8,229 x 324
2,666,196
400
3,992,664 + 213,993 + 4,995,221
9,201,878
400
10,000,009 - 5,674,889
4,325,120
400
Estimate the product 733 x 3
2,100
400
1,299 / 5
259 r 4
400
8,299 x 257
2,132,843
500
5,330,299 + 299,994 + 10,332,993
15,963,286
500
84,300,332 - 4,500,399
79,799,933
500
Estimate the product 8,344 x 5
40,000
500
7,532 / 6
1,255 r 2
500
9,345 x 2,345
21,914,025
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