Unit 7, Lesson 2
Add and Subtract with Tens and Hundreds
Grade 2
Warm-up
Number Talk: Add Multiples of 10
Find the value of each expression mentally.
Activity 1
Show It with Base-Ten Blocks
Use base-ten blocks. Show each number. Then roll a number cube to see how many tens or hundreds to add or subtract.
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Show 297.
- Add _____ hundreds.
- Complete the equation:
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Show 432.
- Add _____ tens.
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Show 982.
- Subtract _____ tens.
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Show 351.
- Add _____ hundreds.
- Write an equation:
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Show 805.
- Subtract ____ hundreds.
- Write an equation:
Activity 2
How Many with Base-Ten Blocks and Equations
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Mai has 2 hundreds, 2 tens, and 3 ones. Lin has 4 hundreds.
Represent their values. Use base-ten blocks or diagrams.
What is the value of their blocks altogether? Show your thinking, using objects, drawings, numbers, or words.
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Andre has 4 hundreds, 2 tens, and 8 ones.
Represent his value. Use base-ten blocks or diagrams.
Andre gives 2 hundreds to Clare.
What is the value of his blocks now?
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Diego has 6 tens. Tyler has 8 hundreds, 3 tens, and 6 ones.
What is the value of their blocks altogether? Show your thinking, using objects, drawings, numbers, or words.
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Elena has 5 hundreds, 7 tens, and 2 ones. She gives 2 tens to Kiran.
What is the value of her blocks now? Show your thinking, using objects, drawings, numbers, or words.
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Priya has 6 hundreds, 5 tens, and 8 ones. Han gives her 3 hundreds.
What is the value of her blocks now? Show your thinking, using objects, drawings, numbers, or words.
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Jada has 4 hundreds, 8 tens, and 2 ones. She gives 3 hundreds to Noah.
What is the value of her blocks now? Show your thinking, using objects, drawings, numbers, or words.
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