Multiplying by 10's
10 X 12 =
120
20 X 20 =
400
31 X 12=
300
23 X 12=
250
How many zeros are in the product 60 X 90?
20 X 18 =
50 X 10=
500
28 X 17 =
600
24 X 31=
750
To find 90 X 30, you multiply ________ and _______.
9 times 3
30 X 34 =
1,020
40 X 40=
1,600
46 X 13 =
500
26 X 42=
1,000
63 is close to _______.
60
40 X 16=
640
30 X 80=
2,400
38 X 36 =
1,600
24 X 61=
1,500
To estimate we could round 24 to ______.
25
70 X 35=
2,450
70 X 60=
4,200
62 X 82 =
4,800
26 X 48=
1,250
Mark estimates 67 X 36 to 70 X 40, will his estimate be bigger or less than the actual answer?
The answer will be greater because he rounded up.