Maths

>

GCSE

>

Positive and Negative Integers

>

How do you...

Question
# How do you add and subtract fractions?

2 years ago

·

1 Reply

·

1457 views

M

Maximillian Veum

1 Answer

Shamim H
Verified Sherpa Tutor ✓

Experienced Maths Teacher (16 yrs) & Examiner for 2 Major Exam Boards

29 reviews

Before you add or subtract fractions you must have a common denominator. 1/2 + 1/2 = 2/2 = 1 that was easy as there was a common denominator. 1/3 + 1/4 = before you can complete this you must have a common denominator as 3 and 4 are not common (same). We reach a common denominator of 12 by either cross multiplying (3 x 4) or look for lowest common multiple (same number in both times table), so that is 12. So we can now add 4/12 + 3/12 = 7 /12 ... Important to remember what ever did to achieve new denominator of 12 you must do the same for the numerator. For example fir the first fraction you multiplied 3 by 4 to get 12 so you must multiply the numerator 1 by 4 to get 4/12.

I'm available for 1:1 private online tuition!

Click here to view my profile and arrange a free introduction.Think you can help?

More Maths GCSE Questions
##
Need
a GCSE
Maths
tutor?

Get started with a free online introductions with an experienced and qualified online tutor on Sherpa.

Find a GCSE Maths Tutor