Rounding
Round the following number to the 10s place: 46
50
424+154=?
578
17-6=?
11
Estimate the following sum:
54+72=?
50+70=120 About 120
4x5=?
20
Round the following number to the 10s place: 142
140
18+235=?
253
174-142=?
32
Estimate the following difference:
68-34=?
70-30=40 About 40
7x10=?
70
Round the following number to the 10s place: 2,478
2,480
742+287=?
1,029
674-258=?
416
Estimate the following sum: 324+469=?
Round to the 100s
300+500=800 About 800
10x11=?
110
Round the following number to the 100s place: 458
500
526+375=?
901
453-365=?
88
Estimate the following difference: 698-232=?
Round to the following 100s
700-200=500 About 500
20x5=?
100
Round the following number to the 100s place: 3,958
4,000
4,257+12,475=?
16,732
802-413=?
389
Estimate the following difference: 567-477=?
Round to the 10s
570-480=90 About 90
3x7=?
21