🎯 WALT: We Are Learning To

Subtract fractions with different denominators using equivalent fractions

✓ Find common denominators to subtract fractions
✓ Use visual models to justify answers
✓ Solve real-world problems with fraction subtraction

📚 Part 1: Finding Common Denominators

1. What is the least common multiple (LCM) of these denominators?

LCM of 4 and 6:

10

12

24

2. Convert these fractions to equivalent fractions with denominator 12:

3/4 = ____/12

1/6 = ____/12

3. Now subtract: 3/4 - 1/6 = ____/12

4. Solve these fraction subtractions. Show your working:

a) 2/3 - 1/4 = ________

b) 5/6 - 2/9 = ________

5. Recipe Problem:

Sarah's recipe calls for 3/4 cup of flour. She has already added 1/3 cup. How much more flour does she need to add?

6. Time Problem:

Jake spent 5/6 of an hour on homework. He spent 1/4 of an hour on maths. How much time did he spend on other subjects?

7. Extension Challenge: Subtract these mixed numbers:

2 1/2 - 1 1/3 = ________

8. Explain in your own words:

Why do we need to find a common denominator before subtracting fractions?