KS2 Primary Maths Age 13-17 - Ratio, Proportion and Algebra: Percentage Problems - Explained

The video tutorial explains how to calculate percentages, focusing on 10% and 20% of a number. It begins with an introduction to percentages as fractions and their importance in arithmetic. The instructor advises using 10% as a base for calculations, demonstrating how to find 10% of 1200 and then using it to calculate 20%. Quick calculation tips are provided for efficient problem-solving.

What is the fraction equivalent of 20%?

• 1/5

• 1/10

• 1/20

• 1/50

How do you calculate 10% of a number?

• Multiply by 10

• Divide by 10

• Divide by 100

• Multiply by 100

What happens to the digits when you calculate 10% of a number?

• Move two places to the right

• Move one place to the right

• Move one place to the left

• Move two places to the left

How can you find 20% of a number using 10%?

• Subtract 10% from 30%

• Divide 10% by 2

• Add 10% twice

• Multiply 10% by 2

What is the quick method for calculating percentages?

• Find 5% first

• Find 10% first

• Find 15% first

• Find 25% first