Solutions by everydaycalculation.com

1^{st} number: 12/15, 2^{nd} number: 3 12/21

1215 + 7521 is 15335.

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

LCM of 15 and 21 is**105**

Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,

1215 = 12 × 715 × 7 = 84105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,

7521 = 75 × 521 × 5 = 375105 - Add the two like fractions:

84105 + 375105 = 84 + 375105 = 459105 - 459/105 simplified gives 15335
- So, 12/15 + 75/21 = 153/35

In mixed form: 41335

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