Answers

Add 21/70 and 2/4

21/70 + 2/4 is 4/5.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 4 is 140
   
   Next, find the equivalent fraction of both fractional numbers with denominator 140
2. For the 1st fraction, since 70 × 2 = 140,
   21/70 = 21 × 2/70 × 2 = 42/140
3. Likewise, for the 2nd fraction, since 4 × 35 = 140,
   2/4 = 2 × 35/4 × 35 = 70/140
4. Add the two like fractions:
   42/140 + 70/140 = 42 + 70/140 = 112/140
5. 112/140 simplified gives 4/5
6. So, 21/70 + 2/4 = 4/5

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