Unit 7, Section A
Add and Subtract within 1,000, without Composition or Decomposition
Grade 2
Practice
Select all representations of the number 318.
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Write a number for each representation.
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Five hundred twenty-seven
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- Here are Kiran’s blocks.
He gives 2 tens to Priya.
What is the value of Kiran’s blocks now? Show your thinking, using objects, drawings, numbers, or words.
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Then Priya gives Kiran 4 hundreds.
What is the value of Kiran’s blocks now? Show your thinking, using objects, drawings, numbers, or words.
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Problem 10
Exploration
Han used a number line to find a difference. Here is his work.
Number line. No tick marks. Arrow from 573 to unlabeled point, labeled 7. Arrow from unlabeled point to unlabeled point labeled 20. Arrow from unlabeled point to unlabeled point labeled 300.
- Write an expression to show the difference Han found. Explain your reasoning.
- Write an addition equation and a subtraction equation to match Han’s work.
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