Add the fractions 2/5 + 3/7.

We must find a common denominator between the fractions to be able to add them (the bottom numbers must be the same). A common denominator of 5 and 7 is 35. To get to 35 from 5 we multiplied by 7, therefore we must multiply the 2 by 7 (whatever you do to the top you must do to the bottom). Our new fraction is 14/35. To get to 35 from 7 we multiplied by 5, therefore we must multiply the 3 by 5. Our second new fraction is 15/35. Now that we have common denominators, we can add the top fractions. 14/35 + 15/35 = 29/35. The fraction cannot be simplified. 29/35 is our answer.

AL
Answered by Alex L. Maths tutor

13333 Views

See similar Maths KS3 tutors

Related Maths KS3 answers

All answers ▸

The formula for the volume of a cone is V=1/3πR^2H. If R=6 and H=5, work out its volume in terms of π.


1) What is the area of a rectangle? 2) What is the area of a triangle?


A triangle has the following dimensions: 5 km, 12 km and 13 m. Is it a right triangle?


Anton, Barbara and Clive are buying pens from the shop. Anton needs 4, Barbara needs 7, Clive needs 11. Pens only come in packs of 10. How many packs of pens do they need to buy between them?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences