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

13597 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.


Asha and Lucy sell pencils. Asha sold 7 boxes, and 22 singles. Lucy sold 5 boxes, and 2 singles. Given Asha sells twice as many pencils as Lucy, work out how many questions are in each box.


Calculate 3/4+3/4*5/7 ?


Simplify fully (3x^2-8x-3)/(2x^2-6x)


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