Round to the nearest ten
Round to the nearest hundred
Estimate the sum
Challenge
100
23
20
100
890
900
100
43+26=
40+30=70 43+26=69
100

Solve by rounding to the nearest ten 63-37=

60-40=About 20
Actual answer 63-37=26

200
57
60
200
147
100
200
90+37=
90+40=130 90+37=127
200

Solve by rounding to the nearest ten 54-22=

50-20= About 30
54-22=32

300
476
480
300
555
600
300

Round to the nearest ten, then estimate the sum: 172+109=

170+110=About 280
172+109=281

300
145-56=
150-60=90 145-56=89
400
923
920
400
451
500
400
205+406
200+400=600 205+406= 611
400

Solve by rounding to the nearest ten: 283-256=

280-260=About 20
283-256= 27

500
178
180
500

2,555

2,600

500
769+445=
800+400=1,200 769+445=1,214
500

Solve by rounding to the nearest thousand: 1,778+356+488=

1,800+400+500=About 2,700

M
e
n
u