Solutions by everydaycalculation.com

45 - 78 is -340.

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

LCM of 5 and 8 is**40**

Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 5 × 8 = 40,

45 = 4 × 85 × 8 = 3240 - Likewise, for the 2nd fraction, since 8 × 5 = 40,

78 = 7 × 58 × 5 = 3540 - Subtract the two like fractions:

3240 - 3540 = 32 - 3540 = -340

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:

Android and iPhone/ iPad

Related: ^{8}/_{5}-^{7}/_{8} ^{4}/_{5}-^{14}/_{8} ^{4}/_{10}-^{7}/_{8} ^{4}/_{5}-^{7}/_{16} ^{12}/_{5}-^{7}/_{8} ^{4}/_{5}-^{21}/_{8} ^{4}/_{15}-^{7}/_{8} ^{4}/_{5}-^{7}/_{24} ^{20}/_{5}-^{7}/_{8} ^{4}/_{5}-^{35}/_{8} ^{4}/_{25}-^{7}/_{8} ^{4}/_{5}-^{7}/_{40} ^{28}/_{5}-^{7}/_{8} ^{4}/_{5}-^{49}/_{8} ^{4}/_{35}-^{7}/_{8} ^{4}/_{5}-^{7}/_{56}

© everydaycalculation.com