Answers

Subtract 21/80 from 16/70

16/70 - 21/80 is -19/560.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 80 is 560
   
   Next, find the equivalent fraction of both fractional numbers with denominator 560
2. For the 1st fraction, since 70 × 8 = 560,
   16/70 = 16 × 8/70 × 8 = 128/560
3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
   21/80 = 21 × 7/80 × 7 = 147/560
4. Subtract the two like fractions:
   128/560 - 147/560 = 128 - 147/560 = -19/560

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