You can times the numerator (4) and denominator (7) by 2 to find a equivalent fraction. 4 x 2 = 8 7 x 2 = 14 You now have 8/14 which is equivalent to 4/7.
You can then times numerator (4) and denominator (7) by 4 to find another equivalent fraction if you would need more than one equivalent fraction.
