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

13323 Views

See similar Maths KS3 tutors

Related Maths KS3 answers

All answers ▸

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.


Write the missing numbers on the lines.


simplify the following equation: 3a x 4ab


A piece of wire is 240cm long. Peter cuts two 45 cm lengths off the wire. He then cuts the rest of the wire into as many 40cm length as possible. How many wires of 40cm can be cut?


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