Mathematics
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           ☆1 fraction calculations

[ 1/1 Fraction calculation ]
    Question type: Fractional subtraction
    Original question: 7/8-3/7
    Solution:
     
7
8
 －  
3
7
    Divide two fractions with defferent denominators:The denominators of two fractions are 8 and 7 respectively,their least common multiple is 56
    Divide the least common multiple 56 by the denominator 8 of the minuend to get 7
    Multiply the numerator 7 and denominator 8 of the subtracted number by 7
    Then divide the least common multiple 56 by the denominator 7 of the subtraction to get 8
    Multiply the subtracted numerator 3 and denominator 7 by 8 at the same time
    = 
49
56
 －  
24
56
Calculation result:
    =
25
56




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