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Question
The number of red cars is 13 and the number of blue cars is 5. Use the ‘make a 10 ’ strategy to find out how many more red cars are there than blue cars? Use the make a 10 strategy to find the answer.
The number of red cars is 13 and the number of blue cars is 5. Use the ‘make a 10 ’ strategy to find out how many more red cars are there than blue cars? Use the make a 10 strategy to find the answer.
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Solution
The correct option is A 8
Say: Let’s read the question.
Ask:
∙ What information do we get from the question?
Ans: The number of red cars is 13 and the number of blue cars is 5.
∙ Is this an addition or subtraction word problem, and why?
Ans: This is a subtraction word problem because we need to find out how many more red cars are there than blue cars. We have to subtract 5 from 13 to get the answer.
∙ To subtract using the “make a ten” strategy, which number should we break down and into what numbers?
Ans: We need to subtract 3 from 13 to make 10. So, we have to break down 5 into 3 and 2.
∙ How do we make ten?
Ans: We subtract 3 from 13 to make 10.
∙ What do we do next?
Ans: We subtract the other number, i.e., 2 from 10 to find the answer. 10–2=8
Hence, option D is the correct answer
WB: If required, use the whiteboard to show the solution.
Probing Question:
Q. After breaking down 5 into 3 and 2, it does not matter which number we subtract from 13, it will still be called the “make a ten” strategy. Is the statement correct? Why?
A: No, because in the “make a ten” strategy, we have to make 10 to subtract. So, only when we subtract 3 from 13, we get 10. If we subtract 2 from 13, we will get 11 and it will not be called the “make a ten” strategy.
Say: Let’s read the question.
Ask:
∙ What information do we get from the question?
Ans: The number of red cars is 13 and the number of blue cars is 5.
∙ Is this an addition or subtraction word problem, and why?
Ans: This is a subtraction word problem because we need to find out how many more red cars are there than blue cars. We have to subtract 5 from 13 to get the answer.
∙ To subtract using the “make a ten” strategy, which number should we break down and into what numbers?
Ans: We need to subtract 3 from 13 to make 10. So, we have to break down 5 into 3 and 2.
∙ How do we make ten?
Ans: We subtract 3 from 13 to make 10.
∙ What do we do next?
Ans: We subtract the other number, i.e., 2 from 10 to find the answer. 10–2=8
Hence, option D is the correct answer
WB: If required, use the whiteboard to show the solution.
Probing Question:
Q. After breaking down 5 into 3 and 2, it does not matter which number we subtract from 13, it will still be called the “make a ten” strategy. Is the statement correct? Why?
A: No, because in the “make a ten” strategy, we have to make 10 to subtract. So, only when we subtract 3 from 13, we get 10. If we subtract 2 from 13, we will get 11 and it will not be called the “make a ten” strategy.
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