KS2 Primary Maths Age 13-17 - Fractions, Decimals and Percentages: Adding and Subtracting Fractions - Explained

The video tutorial explains how to add and subtract fractions by first finding a common denominator. It introduces the concept of the lowest common denominator (LCD) and demonstrates how to convert fractions to have the same denominator. The tutorial then shows how to add fractions by summing their numerators once they share a common denominator, providing a step-by-step example to illustrate the process.

Why is it important for fractions to have the same denominator when adding or subtracting them?

• To convert them into whole numbers

• To ensure the numerators are equal

• To simplify the fractions

• To make the operation possible

What is the lowest common denominator for the fractions 1/4, 1/5, and 1/10?

• 10

• 40

• 20

• 30

How do you convert 1/4 to a fraction with a denominator of 20?

• Multiply both numerator and denominator by 10

• Multiply both numerator and denominator by 2

• Multiply both numerator and denominator by 5

• Multiply both numerator and denominator by 4

What is the equivalent fraction of 1/5 with a denominator of 20?

• 10/20

• 5/20

• 4/20

• 8/20

What is the final result when you add the fractions 5/20, 4/20, and 2/20?

• 9/20

• 12/20

• 10/20

• 11/20