fraction problem 5:
Determine the lowest common denominator and calculate the value, reduce the solution and write as a mixed fractions if possible!
3/4 + 2/3 – 7/10 =
answer:
the lowest common denominator:
4 = 2 * 2
3 = 1 * 3
10 = 2 * 5
2 * 2 * 3 * 5 = 60
calculate the value:
to make the bottom numbers the same you have to multiply the top and the bottom of
the first fraction with 15 (because 4 * 15 = 60)
the second fraction with 20 (because 3 * 20 = 60)
the third fraction with 6 (because 10 * 6 = 60)
3*15/4*15 + 2*20/3*20 – 7*6/10*6 =
45/60 + 40/60 – 42/60 =
85/60 – 42/60 = 43/60