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Bonjour,

Ex. 50 :

1) 2/3 × 3/7 = 6/21

2) 1 - 3/7 = 4/7

3) 2/3 × 4/7 = 8/21

4) a) 630 × (1 / 2/3) = 630 × 1/3 = 210

   b) 630 × 6/21 = 180

   c) 630 × 8/21 = 240

Ex. 51 :

28 × 3/4 = 21      21 - 13/2 = 29/2

28 ÷ 7/2 = 8        8 + 13/2 = 29/2

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