Answers

Add 20/70 and 45/64

20/70 + 45/64 is 443/448.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 64 is 2240
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2240
2. For the 1st fraction, since 70 × 32 = 2240,
   20/70 = 20 × 32/70 × 32 = 640/2240
3. Likewise, for the 2nd fraction, since 64 × 35 = 2240,
   45/64 = 45 × 35/64 × 35 = 1575/2240
4. Add the two like fractions:
   640/2240 + 1575/2240 = 640 + 1575/2240 = 2215/2240
5. 2215/2240 simplified gives 443/448
6. So, 20/70 + 45/64 = 443/448

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