POWERS OF 10

PROBLEMS (3)

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16.   Multiplying and dividing by powers of 10.  Calculate mentally.

 a)  154 × 10 = 1,540 b)  154 × 100 = 15,400 c)  154 × 1000 = 154,000 d)   27 × 10 = 270 e)  27 × 100 = 2,700 f)  27 × 1000 = 27,000 g)  380 × 10 = 3,800 h)  380 ÷ 10  = 38 i)  52,000 × 100 = 5,200,000 j)  52,000 ÷ 100 = 520 k)  140,000 × 1000 = 140,000,000 l)  140,000 ÷ 1000 = 140 m)  8,400 × 10,000 = 84,000,000 n)  8,400 ÷ 10 = 840

17.   a)  \$450 = 10 × \$45

17   b)  \$2,700 = 100 × \$27

17.   c)  \$56,000 = 1000 × \$56

18.   512 is 512 ones.   How much are 512 tens?  5,120

18.   512 hundreds?  51,200  512 thousands  512,000

19.   a)  30 tens = 300 = 3 hundreds

19.   b)  30 hundreds = 3000 = 3 thousands

19.   c)  30 hundreds = 3000 = 300 tens

19.   d)  30 thousands = 30,000 = 300 hundreds

20.   a)  If a number ends in a 0, then it is divisible by 10.

22.   b)  If a number ends in two 0's, then it is divisible by 100.

20.   c)  If a number ends in three 0's, then it is divisible by 1000.

21.   Reduce to lowest terms.

 23.   a) 5060 = 56 b) 200500 = 25 c) 70800 = 7 80

Continue on to the next Lesson.

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