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

The video tutorial explains how to add fractions with different denominators by finding a common denominator. It starts by identifying the need for a common denominator, then demonstrates how to convert fractions to have the same denominator. Finally, it shows how to add the fractions once they share a common denominator, resulting in a simplified answer.

Why can't you directly add the fractions 1/5 and 3/4?

• Because they are improper fractions.

• Because they have different numerators.

• Because they have different denominators.

• Because they are already in simplest form.

What is the lowest common denominator for the fractions 1/5 and 3/4?

• 10

• 25

• 15

• 20

How do you convert 1/5 to a fraction with a denominator of 20?

• Subtract 1 from the denominator.

• Add 15 to the numerator.

• Multiply both the numerator and denominator by 4.

• Multiply both the numerator and denominator by 5.

What is the equivalent fraction of 3/4 with a denominator of 20?

• 12/20

• 13/20

• 14/20

• 15/20

What is the result of adding 4/20 and 15/20?

• 18/20

• 19/20

• 21/20

• 20/20