Ex 7.4 ,7 Find answers to the following. Write and indicate how you solved them. (a) Is 5/9 equal to 4/5? 5/9 & 4/5
To check if numbers are equal,
we make their denominators equal
Common denominator = L.C.M of 5 & 9
= 3 × 3 × 5
= 45
So, 5/9 =
4/5 =
Since 25/45 ≠ 36/45
∴ 5/9 ≠4/5
So, they are not equal.
Ex 7.4 ,7 Find answers to the following. Write and indicate how you solved them. (b) Is 9/16 equal to 5/9 ? 9/16 & 5/9
To check if numbers are equal,
we make their denominators equal
Common denominator = L.C.M of 16 & 9
= 2 × 2 × 2 × 2 × 3 × 3
= 144
So, 9/16 =
5/9 =
Since 81/144 ≠ 80/144
∴ 9/16 ≠5/9
So, they are not equal.
Ex 7.4 ,7 Find answers to the following. Write and indicate how you solved them. (c) Is 4/5 equal to 16/20? 4/5 & 16/20
To check if numbers are equal,
we make their denominators equal
Common denominator = L.C.M of 5 & 20
= 2 × 2 × 5
= 20
So, 4/5 =
16/20
Since 16/20 = 16/20
∴ 16/20 = 4/5
So, they are equal.
Ex 7.4 ,7 Find answers to the following. Write and indicate how you solved them. (d) Is 1/15 equal to 4/30 ? 1/15 & 4/30
To check if they are equal,
we try to make their denominators equal
Common denominator = L.C.M of 15 & 30
= 2 × 3 × 5
= 30
So, 1/15 =
4/30
Since 4/30 ≠ 2/30
∴ 4/30 ≠1/15
So, they are not equal.
Made by
Davneet Singh
Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo
Hi, it looks like you're using AdBlock :(
Displaying ads are our only source of revenue. To help Teachoo create more content, and view the ad-free version of Teachooo... please purchase Teachoo Black subscription.
Please login to view more pages. It's free :)
Teachoo gives you a better experience when you're logged in. Please login :)
Solve all your doubts with Teachoo Black!
Teachoo answers all your questions if you are a Black user!