GCSE Maths - Percentage Increase and Decrease (Multiplier Method) #93

This video tutorial explains how to calculate percentage increases and decreases using two methods: a simple, intuitive technique and a more advanced multiplier method. It covers step-by-step examples for both increasing and decreasing values by a percentage, including real-world applications like discounts. The tutorial also highlights common mistakes and special cases, such as handling percentage changes less than 10% or more than 100%.

Explain the multiplier method for calculating percentage increases.

What is the new mass when increasing 450g by 18%?

How do you calculate a decrease of 320 by 30%?