1.
Estimate. Round to the nearest ten.
A.
100 − 30 = 70
B.
100 − 20 = 80
C.
90 − 30 = 60
D.
90 − 20 = 70
Hint
2.
Estimate. Round to the nearest ten.
A.
60 − 50 = 10
B.
60 − 40 = 20
C.
70 − 50 = 20
D.
70 − 40 = 30
Hint
3.
Pamela's school of 131 students went to a baseball game. Of the students, 68 were girls. About how many were boys?
A.
140 − 60 = 80
B.
130 − 60 = 70
C.
130 − 70 = 60
D.
140 − 70 = 70
Hint
4.
What are the steps you would take to round 428 to the nearest ten?
A.
Notice that the first digit is 4, and then round to 400.
B.
Look at a number line and see whether 428 is closer to 420 or 430.
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 400 or 500.
Hint
5.
Estimate. Round to the nearest ten or use compatible numbers.
62 − 38 = ___
A.
60 − 40 = 20
B.
60 − 30 = 30
C.
70 − 30 = 40
D.
70 − 40 = 30
Hint