problem: fractions calculations add and subtract 4
Determine the lowest common denominator and calculate the value, reduce the solution and write as a mixed fractions if possible!
8/15 + 5/18 – 7/10 =
answer: fractions calculations add and subtract 4
the lowest common denominator:
15 = 3 * 5
18 = 2 * 3 * 3
10 = 2 * 5
2 * 3 * 3 * 5 = 90
to make the bottom numbers the same you have to multiply the top and the bottom of
the first fraction with 6 (because 15 * 6 = 90)
the second fraction with 5 (because 18 * 5 = 90)
the third fraction with 9 (because 10 * 9 = 90)
calculate the value:
8*6/15*6 + 5*5/18*5 – 7*9/10*9 =
48/90 + 25/90 – 63/90 =
73/90 – 63/90 = 10/90
simplify the solution with 10:
10:10/90:10 = 1/9