Maryland Math 4.NOS.B.3.b
The Standard
- 4.NOS.B.3
- Fluently add and subtract multi-digit whole numbers within 1,000,000.
Use computational strategies (e.g., decomposition, partials sums) efficiently.
Maryland College and Career Ready Standards for Mathematics (2025) · USE PLACE VALUE UNDERSTANDING AND PROPERTIES OF OPERATIONS TO PERFORM MULTI-DIGIT ARITHMETIC.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students add and subtract multi-digit whole numbers using place value. They break numbers apart, combine partial results, or trade across places, then choose a method that fits the numbers.
What Mastery Looks Like
- A student sees that 2,999 + 1,001 can become 3,000 + 1,000. They keep place values straight, show their steps, and check a subtraction answer by adding.
Common Misconceptions
- Students may add digits from different places when finding partial sums. When subtracting across a zero, they may skip a needed trade or change only one digit.
How to Assess It
- Exit ticket: Find 4,203 − 1,768 using a strategy you choose. Show your steps and check your answer by adding.
Lesson moves
Ways to Teach It
Give pairs place-value disks to build 3,042, trade disks to subtract 1,578, and record each trade.
Ask, “Would you use partial sums or column addition for 2,468 + 1,375?” Have students show both and explain their choice.
Give partners digit cards to make two four-digit numbers; each finds the sum using partial sums, then checks with another method.
A food drive collected 3,042 cans and packed 1,578; have students calculate the cans left using a place-value strategy.
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Printable 4.NOS.B.3.b Worksheet
A ready-to-print activity worksheet aligned to 4.NOS.B.3.b, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- 5.NOS.B.4.b
Use computational strategies (e.g., partial products, doubling and halving) efficiently to multiply.
- 4.NOS.B.6.b
Use strategies based on place value (e.g., partial quotients) to divide.
- 6.NOS.B.2.b
Use strategies (e.g., partial quotients, inverse relationship between multiplication and division) to divide.
- 3.NOS.D.7.a
Use computational strategies efficiently (e.g., decomposition, partials sums, compensation, make ten/hundred/thousand) to add and subtract.
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