Top answers

GCSE: I don't understand how to rationalise denominators

First, I would make sure the pupil understands why rationalising fractions is necessary. Then I would acquaint them with the relevant vocabulary so they can express their thought process better and understan...
CA
Answered by Cora A. • Maths tutor
4002 Views

How to do add or subtraction fractions?

A fraction a/b consists of a numerator (the part above the bar, a in this example) and a denominator (the part below the bar, b here). In order to add or subtract fractions, we need to make sure the denomina...
ML
Answered by Michelle L. • Maths tutor
4271 Views

A rectangle has an area of 20 cm^2.  Its length and width are enlarged by scale factor 3.  Find the area of the enlarged rectangle.

Area Scale Factor = (Scale Factor) 2 If the scale factor is 3 then: ASF = 3 2 ASF = 9 Area of enlarged rectangle = 20x9 Area of enlarged rectangle = 180cm 2
MU
Answered by Melanie U. • Maths tutor
4769 Views

Rearrange the formula: m = 2ab/4c+b to make b the subject

m = 2ab/4c+b [times both sides by (4c+b)] m(4c+b) = 2ab (expand the bracket) 4cm+bm = 2ab (take away bm from both sides) 4cm = 2ab - bm (take out b as the common factor) 4cm = b(2a-m) [divide both sides by (...
MU
Answered by Melanie U. • Maths tutor
6215 Views

The line L passes through the points (-2,3) and (6,9). How do I find the equation of the line that is parallel to L and passes through the point (5,-1)?

Find the gradient of line L. The gradient can be defined as the "change in y" divided by the "change in x". For this situation, the "change in y" would be 9 - 3 = 6. The "c...
JC
Answered by Justin C. • Maths tutor
15140 Views