Solutions by everydaycalculation.com

715 + 2198 is 143210.

- Find the least common denominator or LCM of the two denominators:

LCM of 15 and 98 is**1470**

Next, find the equivalent fraction of both fractional numbers with denominator 1470 - For the 1st fraction, since 15 × 98 = 1470,

715 = 7 × 9815 × 98 = 6861470 - Likewise, for the 2nd fraction, since 98 × 15 = 1470,

2198 = 21 × 1598 × 15 = 3151470 - Add the two like fractions:

6861470 + 3151470 = 686 + 3151470 = 10011470 - 1001/1470 simplified gives 143210
- So, 7/15 + 21/98 = 143/210

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