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EG-

= -1/2 + 5/8 (LCM IS 8)

= -4+5/8

= 1/8

To add or subtract the rational numbers, we need to make the denominator same, and then add or subtract the numerators. The denominator is written in the bottom.

for ex- 4/5 + 4/2

= 8/10 + 20/10

= 28/10

= 14/5