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Find there least common denominator or lcd

take for an example: 2/5 - 3/8

their LCD is 40. then 40 ÷ 5(denominator of the 1st fract.) × 2 (numerator of the 1st fract.) =16 then copy 40 as its denominator so it becomes 16/40

After performing the first fraction, the second fraction next.

40÷8 ×3 = 15/40.

Lastly, subtract the fractions. 16/40 - 15/40. because their denominator was already the same, just simply subtract their numerator and copy the denominator. the answer is 1/40.