To be able to rewrite the fractions 3/4 and 7/10 as fractions with a least common denominator we have to find the Least Common Denominator of the denominators 4 and 10
Find and list multiples of each number until the first common multiple is found. This is the lowest common multiple or denominator.
Multiples of 4:
4, 8, 12, 16, 20, 24, 28
Multiples of 10:
10, 20, 30, 40
Therefore,
LCD(4, 10) = 20
For Fraction 3/4 we multiply both denominator and numerator by 5
3 x 5 / 4 x 5
= 15/20
For fraction 7/10, we multiply both denominator and numerator by 2
