Wyoming Math 3.NBT.2
The Standard
Fluently add and subtract within 1,000 using strategies and algorithms based on place value, properties of addition, and/or the relationship between addition and subtraction.
2023 Wyoming Mathematics Content and Performance Standards · Use place value understanding and properties of operations to perform multi-digit arithmetic (a range of algorithms may be used).
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students add and subtract numbers up to 1,000 using hundreds, tens, and ones. They trade between place values when needed and use addition to check subtraction.
What Mastery Looks Like
- A student can solve 508 − 169 and 376 + 248 accurately, showing each trade. They can explain their trades and check the subtraction by adding.
Common Misconceptions
- Students may subtract the smaller digit from the larger digit in each column, regardless of which number is on top. A zero in the tens place can make them miss a needed trade from the hundreds place.
How to Assess It
- Ask students to solve 604 − 278, show each trade, and check their answer by adding.
Lesson moves
Ways to Teach It
Give pairs base-ten blocks to build 374 + 258, trading 10 ones for a ten and 10 tens for a hundred.
Ask, "Why does 502 − 178 require a trade through the tens place?" Have students draw and explain each trade.
Deal pairs two three-digit number cards; they find the difference and earn a point only after checking with addition.
Post a library count of 630 books with 275 checked out; students find how many remain and write an addition check.
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Printable 3.NBT.2 Worksheet
A ready-to-print activity worksheet aligned to 3.NBT.2, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- 2.NBT.7
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 ad...
- 1.OA.6
Add and subtract within 20, demonstrating fluency in addition and subtraction within 10. Use strategies such as counting on; making ten using the relationship b...
- 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.
- 2.OA.2
Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know automatically all sums of two one-digit numbers based on strategies.
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