Convert to fraction: Convert 21 to a fraction with a denominator of 10 to match the denominator of 107.21=105 because 1×5=5 and 2×5=10.
Subtract fractions: Subtract 105 from 107.107−105=10(7−5)107−105=102
Simplify fraction: Simplify 2/10. 2/10 can be simplified by dividing both the numerator and the denominator by their greatest common divisor, which is 2. 2/10=(2/2)/(10/2)2/10=1/5
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