Solutions by everydaycalculation.com

23 - 15 is 715.

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

LCM of 3 and 5 is**15** - For the 1st fraction, since 3 × 5 = 15,

23 = 2 × 53 × 5 = 1015 - Likewise, for the 2nd fraction, since 5 × 3 = 15,

15 = 1 × 35 × 3 = 315 - Subtract the two fractions:

1015 - 315 = 10 - 315 = 715

Related: ^{4}/_{3}-^{1}/_{5} ^{2}/_{3}-^{2}/_{5} ^{2}/_{6}-^{1}/_{5} ^{2}/_{3}-^{1}/_{10} ^{6}/_{3}-^{1}/_{5} ^{2}/_{3}-^{3}/_{5} ^{2}/_{9}-^{1}/_{5} ^{2}/_{3}-^{1}/_{15} ^{10}/_{3}-^{1}/_{5} ^{2}/_{15}-^{1}/_{5} ^{2}/_{3}-^{1}/_{25} ^{14}/_{3}-^{1}/_{5} ^{2}/_{3}-^{7}/_{5} ^{2}/_{21}-^{1}/_{5} ^{2}/_{3}-^{1}/_{35}

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