Multiplication
Rounding decimals
addition
greater and less then decimals
Estimates
100
336 x 39
13,104
100
19.703 rounded to the nearest hundredth
19.7
100
2,345,652 + 567,897
2,913,549
100
77.8 is ><= to 77.80
=
100
estimate 43 x 36
1,600
200
50 x 33
1,650
200
2.546 rounded to the nearest tenth
2.5
200
1,234,999 + 1,549,123
2,784,122
200
73.6 is ><= to 073.601
<
200
estimate 59 x 34
1,800
300
536 x 25
13,400
300
round 1.370 to the nearest tenth
1.4
300
76,542,000 + 69,542,498
146,084,498
300
99.150 is ><= to 99.1000
>
300
estimate 18 x 19
400
400
605 x 89
53,845
400
round 3.110 to the nearest whole number
3.
400
666,666,666 + 123,987,456
790,654,122
400
15.1 is ><= to 15.1000
=
400
estimate 99 x 54
5,000
500
2,636 x 56
147,616
500
round 6.65 to the nearest tenth
6.7
500
1,234,256,789 + 7,485,963,210
8,720,219,999
500
.10 is <>= to 1.1000
<
500
estimate and solve 85 x 37
answer= 3,145 estimate= 3,600