16 ) GO...
a) 5487 × ( 65 + 35 ) = 5487 × 100 = 548700
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b) 647 × ( 112 - 12 ) = 647 × 100 = 64700
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c) 502 × 1,008 = ( 500 + 2 ) ( 1,000 + 8 ) = 500,000 + 4,000 + 2,000 + 16 = 506,016
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17 ) Go...
a) 585 × 16 × 625 = 585 × 4 × 4 × 25 × 25 = 585 × 4 × 25 × 4 × 25 = 585 × 100 × 100 = 5,850,000
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b) 147 × 50 × 2 = 147 × 100 = 14,700
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18) Go...
look : 1729 = ( 1400 + 329 ) = 7 × 200 + 7 × 47 = 7 ( 200 + 47 ) = 7 × 247 = 7 × 13 × 19
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19) Go...
look : 96 = 16 × 6 = 2⁴ × 2 × 3 = 2⁵ × 3
Thus ;
the factors are : ( 1 , 2 , 3 , 4 , 6 , 8 , 12 , 16 , 24 , 32 , 48 , 96 )
