
Concept explainers
Group Activity
Use an appropriate physical model for subtraction to solve each of the following problems. Explain your reasoning for choosing each model.
Sneha has assembled 12 computer components so far this shift. If her quota is 20 components, how many more components must she assemble to reach her quota?

The number of components that Sneha must assemble to reach her quota. Where, Sneha has assembled 12 computer components and her quota is 20 components. Use an appropriate physical model for subtraction and explain the reasoning for choosing the model.
Answer to Problem 1GA
Solution:
The number of components that Sneha must assemble to reach her quota is 8.
Explanation of Solution
Given information:
Sneha has assembled 12 computer components and her quota is 20 components.
Explanation:
As there is need to find the number that must be added to 12 so the result is 20 then appropriate model is Missing Addend Model for subtraction.
To find the number of components that Sneha must assemble to reach her quota mean to find 20−12.
For this find the number that must be added to 12 that give the result 20.
Therefore, the appropriate model of subtraction is Missing Addend Model.
Start with 12 computer components:
Continue adding computer components:
Therefore 8 components are needed to give a total of 20. That is, 20−12=8.
Hence, the number of components that Sneha must assemble to reach her quota is 8.
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Chapter 1 Solutions
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