Subtract 30/4 from 98/70, Solve 1 28/70

Subtract 30/4 from 98/70

1^st number: 1 28/70, 2^nd number: 7 2/4

98/70 - 30/4 is -61/10.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 4 is 140

Next, find the equivalent fraction of both fractional numbers with denominator 140
For the 1st fraction, since 70 × 2 = 140,
98/70 = 98 × 2/70 × 2 = 196/140
Likewise, for the 2nd fraction, since 4 × 35 = 140,
30/4 = 30 × 35/4 × 35 = 1050/140
Subtract the two like fractions:
196/140 - 1050/140 = 196 - 1050/140 = -854/140
After reducing the fraction, the answer is -61/10

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