CCSS.Math.Content.6.NS.B.3
The standard
Fluently add, subtract, multiply, and divide multi-digit decimals using the standard algorithm for each operation.
Common Core State Standards for Mathematics · The Number System
What this standard means
Students need to add, subtract, multiply, and divide decimals accurately using the standard algorithms. They should line up decimal points for addition and subtraction, place decimal points correctly in products, and move decimals correctly for division.
Mastery looks like clean work, correct place value, and answers that make sense by estimation. Students often get stuck by lining up digits instead of decimal points, forgetting zeros as placeholders, or placing the decimal in the wrong spot after multiplying or dividing.
Ways to teach it
- Hands-on activity: Give students base-ten blocks or decimal grids to model 1.2 × 0.4 before solving with the standard algorithm.
- Discussion or writing prompt: Ask, "How can estimating first help you catch a decimal point mistake?" and have students explain with one example.
- Quick assessment: Put four decimal problems on an exit ticket, one for each operation, and require an estimate beside each answer.
- Real-world connection: Use a grocery receipt to add prices, subtract a coupon, multiply by quantity, and divide the total cost among friends.
Plan a lesson for CCSS.Math.Content.6.NS.B.3
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Related standards
- CCSS.Math.Content.6.NS.B.2
Fluently divide multi-digit numbers using the standard algorithm.
- CCSS.Math.Content.3.NBT.A.2
Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition a...
- 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.