Add 45/3 and 42/40, Solve 15 0/3 + 1 2/40 as a fraction

Add 45/3 and 42/40

1^st number: 15 0/3, 2^nd number: 1 2/40

45/3 + 42/40 is 321/20.

Find the least common denominator or LCM of the two denominators:
LCM of 3 and 40 is 120

Next, find the equivalent fraction of both fractional numbers with denominator 120
For the 1st fraction, since 3 × 40 = 120,
45/3 = 45 × 40/3 × 40 = 1800/120
Likewise, for the 2nd fraction, since 40 × 3 = 120,
42/40 = 42 × 3/40 × 3 = 126/120
Add the two like fractions:
1800/120 + 126/120 = 1800 + 126/120 = 1926/120
1926/120 simplified gives 321/20
So, 45/3 + 42/40 = 321/20
In mixed form: 161/20

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