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Subtracting Unlike Fractions

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Subtracting Unlike Fractions

Fraction subtraction illustration

📚 Part 1: Finding Common Denominators

I can statement: I can find common denominators and subtract fractions with unlike denominators.

1. Find the common denominator and subtract: 3/4 - 1/6 = ________
2. Subtract and simplify: 5/6 - 2/10 = ________
3. Which is the correct first step to solve 7/12 - 1/4?

Change to 7/12 - 4/16

Change to 7/12 - 3/12

Change to 28/48 - 12/48

4. Subtract: 9/10 - 3/25 = ________
5. Find the difference: 4/5 - 7/20 = ________

📝 Part 2: Word Problems

I can statement: I can solve real-world problems using subtraction of fractions with unlike denominators.

6. Maria walked 3/4 of a mile to school. Her friend Jake walked 2/3 of a mile. How much farther did Maria walk than Jake?

Equation: _________________

Answer: _______ mile

7. A recipe calls for 5/6 cup of flour. Tommy has already added 1/4 cup. How much more flour does he need to add?

Equation: _________________

Answer: _______ cup

8. Sarah ate 7/10 of a pizza. Her brother ate 3/5 of the same pizza. How much more pizza did Sarah eat?

Equation: _________________

Answer: _______ of the pizza

🎯 Part 3: Challenge & Reflection

9. Extension Problem: A carpenter cut 13/20 inches off a board. Later, he cut another 7/50 inches off the same board. How much wood did he cut off in total? Then find how much more he cut the first time than the second time.
10. Explain your strategy for finding common denominators when subtracting fractions. Use the sentence frame below:

When I subtract fractions with different denominators, I first _________________, then I _________________, and finally I _________________.

11. Create Your Own: Write a word problem that requires subtracting fractions with denominators 50 and 100. Then solve it.

Your Problem:

Your Solution:

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