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First, rewrite 2/7 and 3/10
so that they have a common denominator

User Fudo
by
7.2k points

2 Answers

6 votes

Answer: Common denominator = 70

Step-by-step explanation: In order to find a common denominator, we need to find what number they have in common. That'd be 70. So, now rewrite the fractions like this:


(2)/(7) = (?)/(70)


(3)/(10) = (?)/(70)

Now, we need to find the equivalent fractions on the right. To do that, use this formula for part 1:

Right denominator / left denominator

Then, what you get after dividing those 2, you multiply by the left numerator.

So, let's plug the numbers in:

70 / 7 = 10

10 * 2 = 20

Therefore,
(2)/(7) = (20)/(70)

70 / 10 = 7

3 * 7 = 21

Therefore,
(3)/(10) = (21)/(70)

I hope this helped!

User Hoang Subin
by
7.2k points
4 votes

Answer:

The common denominator will be 70

Explanation:

To set the fractions to a common denominator, we need to know what number they both share. In this case, both 7 and 10 share the number 70, since 7 * 10 is 70.

Therefore, we can multiply 2/7 by 10/10 and 3/10 by 7/7:


(2)/(7) *
(10)/(10) =
(20)/(70)


(3)/(10) *
(7)/(7) =
(21)/(70)

User Suztomo
by
7.1k points