How do you do a subtraction fraction

Mathematics

2 answers:

NemiM [27]3 years ago

8 0

3/4−2/5=7/20

Solution with Steps

3/4−2/5=?

The fractions have unlike denominators. First, find the Least Common Denominator and rewrite the fractions with the common denominator.

LCD(3/4, 2/5) = 20

Multiply both the numerator and denominator of each fraction by the number that makes its denominator equal the LCD. This is basically multiplying each fraction by 1.

(3/4×5/5)−(2/5×4/4)=?

Complete the multiplication and the equation becomes

15/20−8/20=?

The two fractions now have like denominators so you can subtract the numerators.

Then:

15−8/20=7/20

This fraction cannot be reduced.

Therefore:

3/4−2/5=7/20

Solution by Formulas

Apply the fractions formula for subtraction, to

3/4−2/5

and solve

(3×5)−(2×4)/4×5

=15−8/20

=7/20

Therefore:

3/4−2/5=7/20

Airida [17]3 years ago

5 0

Answer:

divide top from bottom

Step-by-step explanation:

You might be interested in

I need help on 10 13 16

Zepler [3.9K]

$10.\\1ft=0.3048m\to1m=\dfrac{10000}{3048}ft\approx3.281ft\\\\therefore\ 14m\approx14\cdot3.28ft1=45.93ft$

$13.\\1mi=1.609km\to1km=\dfrac{1000}{1609}mi\approx0.621mi\\\\therefore\ 0.3km\approx0.3\cdot0.621mi=0.186mi$

$1in=2.54cm\to1cm=\dfrac{100}{254}in\approx0.394in\\\\therefore\ 15cm\approx15\cdot0.394in=5.91in$

3 0

3 years ago

May someone please explain to me how to do this in the easiest way? I don't really understand. Thanks❤

katrin [286]

Ok, so 1 is a whole number. 1/5 is a fraction of 1. So you want to subtract 1/5 from 1. The number 1 is equal to 5/5. So if you subtract 1/5 from 5/5 you are left with 4/5. You do the same with the second one, just subtract 3/5 from 5/5 to get your answer.

8 0

3 years ago

Read 2 more answers

Marta is solving the equation S = 2πrh + 2πr^2 for h. Which should be the result?

olga_2 [115]

Answer:

h = $\frac{S}{2πr}$ - r