1. 5/7 - 2/3
= (21 ÷ 7) × 5 - (21 ÷ 3) × 2/21
= (3 × 5) - (7 × 2)/21
= 15 - 14/21
= 1/21
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1. 5/7 - 2/3
= (21 ÷ 7) × 5 - (21 ÷ 3) × 2/21
= (3 × 5) - (7 × 2)/21
= 15 - 14/21
= 1/21