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What is the difference between LCM and HCF?

LCM stands for Lowest Common Multiple , and HCF stands for Highest Common Factor . The key to telling the difference between these two things is knowing the difference between a multiple and a factor . A mul...
JC
Answered by Joe C. • Maths tutor
122125 Views

Rationalise the following: { 5 } / { 3 - sqrt(2) }

The aim here is to turn the fraction so that the denominator does not have a surd. Given that we know that any surd squared is equal to the number itself, i.e sqrt(2) * sqrt(2) equas 2, or sqrt(x) * sqrt(x) ...
AS
Answered by Amin S. • Maths tutor
6977 Views

Solve the equation: x^2 + 9x + 20 = 0

This is a quadratic equation. There are different ways to solve quadratic equations including factorising them and using the quadratic formula. This is a simple equation so it cn be solved by factorising. It...
FM
Answered by Francesca M. • Maths tutor
10666 Views

What is 3/5 of 65.

Break this question into 2. Divide 65 by 5 = 13 13 x 3 = 39
AA
Answered by Alice A. • Maths tutor
14435 Views

In a sale, a bag goes on sale and the price is reduced by 20%. The sale price is £29.40. What is the original price of the bag.

The price of the bag has been reduced by 20% therefore the sale price of the bag is 80% of the full price. If we divide the sale price by 80 to get 1% of the price, we get £29.40/80 = £0.3675. We then mutlip...
AM
Answered by Aleyna M. • Maths tutor
5180 Views