CCSS.Math.Content.6.NS.B
The standard
Compute fluently with multi-digit numbers and find common factors and multiples.
Common Core State Standards for Mathematics
What this standard means
Students need to add, subtract, multiply, and divide multi-digit whole numbers and decimals accurately and efficiently. They also need to find greatest common factors and least common multiples, then use them to solve problems like grouping items or matching cycles.
Mastery looks like choosing a sensible method, checking for reasonableness, and explaining why a factor or multiple fits. Students often mix up factors and multiples, make place value errors with decimals, or rely on slow counting instead of using prime factors, division facts, or organized lists.
Ways to teach it
- Hands-on: Give pairs 24 tiles and 36 tiles, then have them build equal groups to find common factors and the greatest common factor.
- Prompt: Write about whether 18 is a factor or a multiple of 72, and prove your answer with an equation.
- Quick assessment: Ask students to compute 4.8 × 36 and find the LCM of 8 and 12 on an exit ticket.
- Real-world connection: Plan snack bags with 30 crackers and 45 grapes, making identical bags with no leftovers.
Plan a lesson for CCSS.Math.Content.6.NS.B
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Related standards
- CCSS.Math.Content.6.NS.B.3
Fluently add, subtract, multiply, and divide multi-digit decimals using the standard algorithm for each operation.
- CCSS.Math.Content.6.NS.B.2
Fluently divide multi-digit numbers using the standard algorithm.
- CCSS.Math.Content.5.NBT.B.5
Fluently multiply multi-digit whole numbers using the standard algorithm.
- CCSS.Math.Content.4.NBT.B.4
Fluently add and subtract multi-digit whole numbers using the standard algorithm.