Answers

Subtract 42/84 from 40/10

1^st number: 4 0/10, 2^nd number: 42/84

40/10 - 42/84 is 7/2.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 10 and 84 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 10 × 42 = 420,
   40/10 = 40 × 42/10 × 42 = 1680/420
3. Likewise, for the 2nd fraction, since 84 × 5 = 420,
   42/84 = 42 × 5/84 × 5 = 210/420
4. Subtract the two like fractions:
   1680/420 - 210/420 = 1680 - 210/420 = 1470/420
5. After reducing the fraction, the answer is 7/2
6. In mixed form: 31/2

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