Family Math Studio
Lesson 1.25.NF.B.4
Math is Exploring and Thinking
Find a fraction of a whole number: divide by the bottom, then multiply by the top.
NameDate
Tonight's spark
A school garden map shows 60 pea pods on the vines. A sign says 2/3 of them are ready to pick. How many pods are ready?
Make a guess first: are more than half of the pods ready, or fewer?
Try it
Work it out on paper. Write one answer on each line.
What is 1/2 of 10?
- A. 5
- B. 20
- C. 12
My answer
What is 1/3 of 12?
- A. 36
- B. 9
- C. 4
- D. 15
My answer
To find 3/4 of 20, what do you do first?
- A. Multiply 20 by 3
- B. Divide 20 by 4
- C. Divide 20 by 3
- D. Add 20 and 4
My answer
What is 2/3 of 30?
- A. 10
- B. 15
- C. 60
- D. 20
My answer
A box has 20 crayons. 3/5 of them are used. How many crayons are used?
- A. 4
- B. 12
- C. 60
- D. 15
My answer
A class has 35 students. 2/5 of them walk to school. How many students walk?
- A. 14
- B. 7
- C. 70
- D. 33
My answer
Talk about it
Can two thirds of the pods be more than all of the pods?
Home mission
A different situation: set out 12 beans, coins, or pasta pieces. Ask your student to make 3 equal piles. Then ask for 2/3 of the beans. How many is that?
If we get stuck, ask
- How many equal groups does the bottom number ask for?
- What is one of those groups worth?
- Does your answer make sense compared to the whole?