Answers

Subtract 21/80 from 84/45

1^st number: 1 39/45, 2^nd number: 21/80

84/45 - 21/80 is 77/48.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 45 and 80 is 720
   
   Next, find the equivalent fraction of both fractional numbers with denominator 720
2. For the 1st fraction, since 45 × 16 = 720,
   84/45 = 84 × 16/45 × 16 = 1344/720
3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
   21/80 = 21 × 9/80 × 9 = 189/720
4. Subtract the two like fractions:
   1344/720 - 189/720 = 1344 - 189/720 = 1155/720
5. After reducing the fraction, the answer is 77/48
6. In mixed form: 129/48

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