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Learn · Illustrative Mathematics · Grade 6 · Unit 5

Arithmetic in Base Ten

Short lessons you can play with. Bundle tenths and hundredths, place the decimal point, shade hundredths grids, divide in chunks, and ring up an order, then check yourself. When you’re ready, practice in Decimal Diner.

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For grown-ups

How it works

Six short chapters follow the unit’s lessons in order. Each step shows one idea with something to change, then a quick check. A wrong answer names the likely mistake and gives one more try.

The tools from class

Base-ten pieces for tenths and hundredths, numbers in columns with the decimal points lined up, hundredths grids and area diagrams for multiplying, and partial quotients for dividing.

Practice

Each chapter ends with a link to the matching station in Decimal Diner, the practice game for this unit. Progress is saved on this device.

Not covered

Lesson 15 (Making and Measuring Boxes) is a hands-on project, so it works better in class.