Answers

Subtract 40/21 from 80/18

1^st number: 4 8/18, 2^nd number: 1 19/21

80/18 - 40/21 is 160/63.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 18 and 21 is 126
   
   Next, find the equivalent fraction of both fractional numbers with denominator 126
2. For the 1st fraction, since 18 × 7 = 126,
   80/18 = 80 × 7/18 × 7 = 560/126
3. Likewise, for the 2nd fraction, since 21 × 6 = 126,
   40/21 = 40 × 6/21 × 6 = 240/126
4. Subtract the two like fractions:
   560/126 - 240/126 = 560 - 240/126 = 320/126
5. After reducing the fraction, the answer is 160/63
6. In mixed form: 234/63

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