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Multi-Digit and Fraction Computation

Lesson 9

Objective

Multiply decimals using the standard algorithm.

Common Core Standards

Core Standards

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  • 6.NS.B.3 — Fluently add, subtract, multiply, and divide multi-digit decimals using the standard algorithm for each operation.

Foundational Standards

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  • 5.NBT.B.5

  • 5.NBT.B.7

Criteria for Success

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  1. Multiply decimals using the standard algorithm.
  2. Solve word problems involving decimals using the standard algorithm. 

Tips for Teachers

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  • Multiplying with decimals is a fluency expectation in sixth grade. Ensure students have opportunities to build towards fluency throughout the unit and the year. There are two quick Anchor Problems in this lesson in order to leave plenty of time for practice. Students can get further practice with this skill when they get to division with decimals; students can use multiplication to check their answers. See our Guide to Procedural Skill and Fluency for additional notes and strategies.
  • The following tools or materials are useful for this lesson: large graph or grid paper for computations, calculators to check answers.

Remote Learning Guidance

If you need to adapt or shorten this lesson for remote learning, we suggest prioritizing Anchor Problem 1 (benefits from worked example). If students have a strong grasp on using the standard algorithm to multiply decimals, then this Anchor Problem can either be skipped or done independently. Find more guidance on adapting our math curriculum for remote learning here.

Fishtank Plus

Subscribe to Fishtank Plus to unlock access to additional resources for this lesson, including:

  • Problem Set
  • Student Handout Editor
  • Google Classrom Integration
  • Vocabulary Package

 

Anchor Problems

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Problem 1

Calculate the product using the standard algorithm: $${306.32 \times 8.4}$$

Guiding Questions

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Problem 2

At the grocery store, ground beef is on sale for $4.25 per pound. How much would 3.75 pounds of ground beef cost? Round your answer to the nearest cent.

Guiding Questions

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Problem Set

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With Fishtank Plus, you can download a complete problem set and answer key for this lesson. Download Sample

The following resources include problems and activities aligned to the objective of the lesson that can be used to create your own problem set.

  • Include opportunities for procedural practice. A search for “decimal multiplication problems” will result in several different worksheets.

Target Task

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Problem 1

Find the product of 39.56 and 65.8.

 

Problem 2

Gas costs $2.89 per gallon, and Alex fills his gas tank with 12.06 gallons. How much does he pay for gas? Give your answer to the nearest penny.

Mastery Response

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