Let's solve each of these fraction word problems step by step.
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Problem 1:
A pan of brownies was left out on the counter and 1/4 of the brownies had already been eaten. Then John came along and ate 2/3 of the brownies that were left. How much of the whole pan of brownies did John eat?
Step 1: Determine how much was left after 1/4 was eaten.
- Whole pan = 1
- Eaten before John: 1/4
- Left: $ 1 - \frac{1}{4} = \frac{3}{4} $
Step 2: John ate 2/3 of the remaining 3/4.
- $ \frac{2}{3} \times \frac{3}{4} = \frac{6}{12} = \frac{1}{2} $
✔ Answer: John ate
1/2 of the whole pan of brownies.
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Problem 2:
You have 6 donuts and you want to give 2/3 of them to a friend and keep 1/3 for yourself. How many donuts would your friend get?
- Total donuts = 6
- Friend gets: $ \frac{2}{3} \times 6 = \frac{12}{3} = 4 $
✔ Answer: Your friend gets
4 donuts.
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Problem 3:
A baker is making cakes for a big party. She uses 1/4 cup of oil for each cake. How many cakes can she make if she has a bottle of oil that has 15 cups in it?
- Oil per cake = 1/4 cup
- Total oil = 15 cups
- Number of cakes = $ 15 \div \frac{1}{4} = 15 \times 4 = 60 $
✔ Answer: She can make
60 cakes.
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Problem 4:
The serving size for the granola that Wilma likes to eat for breakfast is 1/2 cup. How many servings are there in a box that holds 32 cups?
- Serving size = 1/2 cup
- Total = 32 cups
- Number of servings = $ 32 \div \frac{1}{2} = 32 \times 2 = 64 $
✔ Answer: There are
64 servings.
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Problem 5:
Mrs. Smith’s class is making vests. Each vest uses 2/3 of a yard of fabric. How many vests can they make out of 18 yards of fabric?
- Fabric per vest = 2/3 yard
- Total fabric = 18 yards
- Number of vests = $ 18 \div \frac{2}{3} = 18 \times \frac{3}{2} = \frac{54}{2} = 27 $
✔ Answer: They can make
27 vests.
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Problem 6:
There was a bowl with 120 candies in it. Billy, Bob and Buck found the bowl. Billy ate 2/12 of the candies, Bob ate 3/12 and Buck had 5/12. How many candies were left?
Step 1: Add up the fractions eaten:
- $ \frac{2}{12} + \frac{3}{12} + \frac{5}{12} = \frac{10}{12} = \frac{5}{6} $
Step 2: Find how many candies were eaten:
- $ \frac{5}{6} \times 120 = \frac{5 \times 120}{6} = \frac{600}{6} = 100 $
Step 3: Subtract from total:
- $ 120 - 100 = 20 $
✔ Answer: 20 candies were left.
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✔ Final Answers:
1.
1/2 of the pan
2.
4 donuts
3.
60 cakes
4.
64 servings
5.
27 vests
6.
20 candies left
Let me know if you'd like these explained visually or with diagrams!
Parent Tip: Review the logic above to help your child master the concept of fraction word problems worksheet pdf.