Question

3/4-1/2+2/5=
i know it equals 13/20
but i dnt knw why

Answer 1

3/4-1/2+2/5
lowest common denominator is 20

Answer 2

Adding or subtracting fractions requires that they have common denominators.
In this case, all the fractions should have denominators of 20.

Answer 3

4times5+20

Answer 4

so 3times 5+15

Answer 5

2*10+20
so
1*10+10

Answer 6

5*4+20
so
2*4+8

Answer 7

5*3-10*1+4*2/20
15-10+8/20
13/20

Answer 8

how did you guys get 20?

Answer 9

all the numbers that are on the bottom of the fraction can all be multilied by another number to equal 20

Answer 10

20 is LCM of 4,2,5

Answer 11

sorry, multiplied, not multilied

Answer 12

ohhhh now i see it
i just always get confused with that

Answer 13

its fine, i get confused alot too

Answer 14

i understand how to get the common denominator now but if i saw another problem lik this id get stumped again

Answer 15

first take the lcm which will be 20 and numerator will be 13 as this:
3/4-1/2+2/5=13/20