Using Powers Of Ten And Halves - Math Worksheet With Answer Key

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Using Powers of Ten and Halves
Break each problem down using powers of ten and/or halves to solve.
A n s w e r s
1)
2)
7,200
90
60 × 120 =
× 60 = 5,400
7,200
1.
= 540
72
90
6 × 12 =
× 6
90
= 54
36
9
6 × 6 =
× 6
2.
50
3.
3)
4)
50
11,200
× 60 = 3,000
140 × 80 =
11,200
4.
= 300
50
112
× 6
14 × 8 =
= 30
5
56
× 6
7 × 8 =
42,000
5.
80
6.
5)
6)
42,000
80
60 × 700 =
90 ×
= 7,200
90
= 720
420
80
6 × 70 =
9 ×
7.
= 72
42
8
6 × 7 =
9 ×
840
8.
80
7)
8)
90
× 50 = 4,500
30 × 28 =
840
9.
= 450
90
42
× 5
3 × 14 =
1,600
10.
= 45
9
21
× 5
3 × 7 =
28,000
11.
9)
10)
60 ×
80
= 4,800
80 × 20 =
1,600
1,440
12.
= 480
80
80
6 ×
8 × 10 =
4,000
13.
= 48
8
40
6 ×
8 × 5 =
12,600
14.
11)
12)
700 × 40 =
28,000
40 × 36 =
1,440
280
72
70 × 4 =
4 × 18 =
28
36
7 × 4 =
4 × 9 =
13)
14)
40 × 100 =
4,000
70 × 180 =
12,600
40
126
4 × 10 =
7 × 18 =
20
63
4 × 5 =
7 × 9 =
1-10 93 86 79 71 64 57 50 43 36 29
Math
4
11-14 21 14 7
0

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