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

The video tutorial explains how to subtract mixed numbers with different denominators. It begins by converting mixed numbers into improper fractions, then finding the lowest common denominator (LCD) to make the denominators the same. The fractions are converted to equivalent fractions with the LCD, and subtraction is performed on the numerators. The final result is presented as an improper fraction, with an option to convert it back to a mixed number. The tutorial emphasizes accuracy and understanding of mixed numbers, improper fractions, and common denominators.

What is the first step in subtracting mixed numbers with different denominators?

• Convert them to improper fractions

• Find the greatest common factor

• Add the fractions

• Multiply the fractions

How do you find the lowest common denominator (LCD) for two fractions?

• Add the denominators

• Find a common multiple of the denominators

• Multiply the numerators

• Subtract the denominators

What is the equivalent fraction of 14/3 with a denominator of 21?

• 42/21

• 98/21

• 28/21

• 84/21

After converting fractions to have the same denominator, what is the next step?

• Add the numerators

• Multiply the numerators

• Divide the numerators

• Subtract the numerators

What is the result of subtracting 39/21 from 98/21?

• 59/21

• 49/21

• 69/21

• 79/21

What is the mixed number form of 59/21?

• 2 and 17/21

• 3 and 5/21

• 1 and 18/21

• 2 and 16/21

Why is accuracy important in these calculations?

• To make the process faster

• To simplify the fractions

• To avoid errors in the final answer

• To ensure the result is a whole number