1.
Estimate. Round to the nearest ten or use compatible numbers.
A.
90 − 30 = 50
B.
100 − 20 = 75
C.
50 − 25 = 25
D.
95 − 25 = 70
Hint
2.
Estimate. Round to the nearest hundred.
A.
200 − 0 = 200
B.
180 − 60 = 120
C.
200 − 100 = 100
D.
150 − 50 = 100
Hint
3.
What are the steps you would take to round 428 to the nearest ten?
A.
Look at a number line and see whether 428 is closer to 400 or 500.
B.
Notice that the first digit is 4, and then round to 400.
C.
Notice that the first two digits are 4 and 2, and then round to 420.
D.
Look at a number line and see whether 428 is closer to 420 or 430.
Hint
4.
Estimate. Round to the nearest ten or use compatible numbers.
62 − 38 = ___
A.
70 − 30 = 40
B.
70 − 40 = 30
C.
60 − 30 = 30
D.
60 − 40 = 20
Hint
5.
Estimate. Round to the nearest hundred.
425 − 298 = ___
A.
400 − 300 = 100
B.
500 − 300 = 200
C.
430 − 300 = 130
D.
400 − 200 = 200
Hint