Answers

Add 2/70 and 21/80

2/70 + 21/80 is 163/560.

Steps for adding 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,
   2/70 = 2 × 8/70 × 8 = 16/560
3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
   21/80 = 21 × 7/80 × 7 = 147/560
4. Add the two like fractions:
   16/560 + 147/560 = 16 + 147/560 = 163/560
5. So, 2/70 + 21/80 = 163/560

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