Solutions by everydaycalculation.com

4/21 + 7/45 is 109/315.

1. Find the least common denominator or LCM of the two denominators:
LCM of 21 and 45 is 315
2. For the 1st fraction, since 21 × 15 = 315,
4/21 = 4 × 15/21 × 15 = 60/315
3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
7/45 = 7 × 7/45 × 7 = 49/315
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