1.
Estimate. Round to the nearest ten or use compatible numbers.
A.
100 − 20 = 75
B.
90 − 30 = 50
C.
50 − 25 = 25
D.
95 − 25 = 70
Hint
2.
Estimate. Round to the nearest ten or use compatible numbers.
A.
75 − 50 = 20
B.
40 − 30 = 10
C.
100 − 25 = 75
D.
70 − 40 = 30
Hint
3.
Estimate. Round to the nearest hundred.
A.
500 − 300 = 200
B.
600 − 300 = 300
C.
500 − 200 = 300
D.
530 − 300 = 230
Hint
4.
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 two digits are 4 and 2, and then round to 420.
C.
Notice that the first digit is 4, and then round to 400.
D.
Look at a number line and see whether 428 is closer to 420 or 430.
Hint
5.
Estimate. Round to the nearest hundred.
425 − 298 = ___
A.
430 − 300 = 130
B.
400 − 300 = 100
C.
500 − 300 = 200
D.
400 − 200 = 200
Hint