How do I add fraction with uncommon denominators?

Question

-29/35+3/10=

How would I solve this equation I understand I need to find the lowest common denominator but unsure about the rest? Would I need to multiple different denominations

Answer 1

The least common denominator for 35 and 10 is 70. Now you will need to write equivalent fractions for the ones in you problem using 70 as a denominator.

-29 * 2 = -58

35 2 70

Then:

3 * 7 = 21

10 7 70

Now you can add the fractions:

-58 + 21 = -37

70 70 70