Wyoming Math 2.NBT.7
Standard Cluster
Add and subtract within 1,000, using concrete models or drawings and strategies based on place value, properties of addition, and/or the relationship between addition and subtraction: Relate the strategy to a written method and explain the reasoning used. Understand that in adding or subtracting three-digit numbers, add or subtract hundreds and hundreds, tens and tens, ones and ones. Understand that sometimes it is necessary to compose or decompose tens or hundreds.
2023 Wyoming Mathematics Content and Performance Standards · Use place value understanding and properties of operations to add and subtract.
Cluster contents
Standards in This Cluster
2.NBT.7 is a cluster heading. These are the individual standards under it.
- 2.NBT.7a
Relate the strategy to a written method and explain the reasoning used.
- 2.NBT.7b
Understand that in adding or subtracting three-digit numbers, add or subtract hundreds and hundreds, tens and tens, ones and ones.
- 2.NBT.7c
Understand that sometimes it is necessary to compose or decompose tens or hundreds.
Teacher's field guide
What This Cluster Means
What Students Need to Do
- Students add and subtract three-digit numbers by working with hundreds, tens, and ones. They use blocks or drawings, then show how those steps match a written method.
What Mastery Looks Like
- A student can solve 268 + 157 and 532 − 176 with a drawing and a written method. They can explain each trade, such as exchanging one hundred for ten tens.
Common Misconceptions
- Students may subtract the smaller digit from the larger digit in each column, regardless of which number is on top. They may also trade one hundred for one ten instead of ten tens.
How to Assess It
- Give an exit ticket: Solve 405 − 178 with a place value sketch and a written method. Label each trade and explain why you made it.
Lesson moves
Ways to Teach It
Give pairs base ten blocks to build 532, remove 176, and record each trade before writing the subtraction.
Show 268 + 157 and ask: Where do the ten extra ones go in your drawing and written method?
Give pairs two number cards from 100 to 450; have them add, sketch their steps, and check with a written method.
Tell students the cafeteria has 600 napkins and uses 275; ask them to draw and calculate how many remain.
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Printable 2.NBT.7 Worksheet
A ready-to-print activity worksheet aligned to 2.NBT.7, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- 1.NBT.4
Add within 100, using concrete models or drawings and strategies based on place value:
- 3.NBT.2
Fluently add and subtract within 1,000 using strategies and algorithms based on place value, properties of addition, and/or the relationship between addition an...
- 2.NBT.5
Add and subtract within 100 using strategies based on place value, properties of addition, and/or the relationship between addition and subtraction.
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