Answer:
7/20
Explanation:
Let's make both denominators equal to 20. To do this, you need to multiply both the numerator and denominator by the same number. Start with 3/4.
What number that when multiplied by 4 will give you 20?
That's right, 5. Let's multiply the numerator and denominator by 5 to create a new, but equivalent, fraction.
Numerator:
3 x 5 = 15
Denominator:
4 x 5 = 20
The new fraction is 15/20
Now, let's do the same thing for the fraction 2/5.
What number that when multiplied by 5 will give you 20?
You're right, it's 4! Let's multiply the numerator and denominator by 4 to create a new fraction.
Numerator:
2 x 4 = 8
Denominator:
5 x 4 = 20
The new fraction is 8/20
Finally, subtract! In order to subtract, all you have to do is subtract the numerators and keep the denominators the same.
15/20 - 8/20 = 7/20
(This is because 15 - 8 = 7)
Good job, you just subtracted fractions with different denominators! Hope this helps :)