now i don't understand this one

Question

now i don't understand this one

Add Or SSubtract

2/5 - 7/8=??
what do i have to do?

Answer 1

Do you know how to find the common denominator and change both fractions?

Answer 2

mm i guess

Answer 3

What's your new denominator and fractions?

Answer 4

i gat 16/40 and 35/40 so do i have to subtract 35-16?? or what???

Answer 5

you have to find a common denominator for both

2/5
7/8 2/5*---=19/40

Answer 6

first get the least common denominator (LCD),, what is the common multiple of 5 and 8, or what is the smallest number in which it is divisible by 5 and 8?

i get LCD = 40 :this is the denominator
therefore, for the numerator multiply 40 to the fractions:
40[2/5 - 7/8]
2(8)-7(5) = -19
therefore,
2/5 - 7/8= -19/40

so there,, =)

Answer 7

it da answer - 19/40???

Answer 8

yeah so do you understand it now?

Answer 9

16/40 and 35/40 is right. 16/40-35/40=? Do 16-35, use a calculator if you need to. That's your numerator (top number of a fraction). The 40 is your denominator (bottom number).

Answer 10

now i don't understand this one

Do you know how to find the common denominator and change both fractions?

mm i guess

What's your new denominator and fractions?

i gat 16/40 and 35/40 so do i have to subtract 35-16?? or what???

you have to find a common denominator for both

first get the least common denominator (LCD),, what is the common multiple of 5 and 8, or what is the smallest number in which it is divisible by 5 and 8?

it da answer - 19/40???

yeah so do you understand it now?

16/40 and 35/40 is right. 16/40-35/40=? Do 16-35, use a calculator if you need to. That's your numerator (top number of a fraction). The 40 is your denominator (bottom number).

so whats the answer?