fraction problem 2:
Determine the lowest common denominator and calculate the value, reduce the solution and write as a mixed fractions if possible!
2 3/5 – 1 1/4 + 3 3/10 =
answer:
the lowest common denominator:
5 = 1 * 5
4 = 2 * 2
10 = 2 * 5
2 * 2 * 5 = 20
calculate the value:
to make the bottom numbers the same you have to multiply the top and the bottom of
the first fraction with 4 (because 5 * 4 = 20)
the second fraction with 5 (because 4 * 5 = 20)
the third fraction with 2 (because 10 * 2 = 20)
13/5 – 5/4 + 33/10 =
13*4/5*4 – 5*5/4*5 + 33*2/10*2 =
52/20 – 25/20 + 66/20 =
118/20 – 25/20 = 93/20
write as a mixed fraction:
93/20 = 4 13/20 (93 : 20 = 4 and 13/20)