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    Use the information 639 × 8.5 = 5431.5 to find the value of
    (a) 6.39×85
    (b) 543.15÷850

    From a non calculator paper
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    6.39 = 639 ÷ 100
    85 = 8.5 x 10
    so 6.39 x 85 = 639 ÷ 100 x 8.5 x 10
    = 639 x 8.5 x (10 ÷ 100)
    = 5431.5 ÷ 10
    = 543.15

    Try using this to solve b)
 
 
 
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