Multiply by 10 or 100
10 x 4 =
40
3 x 40 =
120
200 x 3 =
600
10 x 9 =
90
60 x 8 =
480
7 x 800 =
5,600
100 x 7 =
700
70 x 9 =
630
900 x 8 =
7,200
100 x 10 =
1,000
80 x 40 =
3,200
40 x 500 =
20,000
100 x 100 =
10,000
90 x 60 =
5,400
70 x 900 =
63,000