Maryland Math 4.NOS.B.4
The Standard
Extend place value understanding and basic facts to multiply a multi-digit whole number by a multiple of ten.
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 multiply a multi-digit whole number by 20, 30, or another multiple of ten. They use basic facts and place value to find the product.
What Mastery Looks Like
- A student finds 246 × 30 by calculating 246 × 3 = 738, then multiplying 738 by 10 to get 7,380. They can explain that 30 means three tens and check that the answer is a reasonable size.
Common Misconceptions
- Some students get 738 for 246 × 30 because they treat 30 as 3. Others add two zeros instead of one, or calculate 204 × 30 as though 204 were 24.
How to Assess It
- Exit ticket: Solve 246 × 30. Show 246 × 3 first, then explain why your final answer is ten times as large.
Lesson moves
Ways to Teach It
Use counters on a place-value chart to show 124 × 3, then shift each counter one column left to show 124 × 30.
Ask students to write one sentence explaining why 246 × 30 is ten times 246 × 3.
Give pairs three-digit number cards and tens cards; have them multiply, then check each answer using expanded form.
A school orders 30 packs of 120 stickers; have students calculate the total and write it on a supply order.
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Printable 4.NOS.B.4 Worksheet
A ready-to-print activity worksheet aligned to 4.NOS.B.4, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- 4.NOS.A.1
Apply and extend place value understanding to multi-digit whole numbers within 1,000,000.
- 3.NOS.A.1
Apply and extend place value understanding to whole numbers within 10,000.
- 4.NOS.A.2
Explain that in a multi-digit whole number, a digit in one place represents ten times what it represents in the place to its right (e.g., recognize that 700 ÷ 7...
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