Solutions by everydaycalculation.com

3/45 + 2/7 is 37/105.

1. Find the least common denominator or LCM of the two denominators:
LCM of 45 and 7 is 315
2. For the 1st fraction, since 45 × 7 = 315,
3/45 = 3 × 7/45 × 7 = 21/315
3. Likewise, for the 2nd fraction, since 7 × 45 = 315,
2/7 = 2 × 45/7 × 45 = 90/315
21/315 + 90/315 = 21 + 90/315 = 111/315
5. 111/315 simplified gives 37/105
6. So, 3/45 + 2/7 = 37/105

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