Study Guides

Unit Summary

In this unit pupils will extend their understanding of formal calculation strategies to use column methods to add and subtract with decimal numbers.

Lesson Summary

You will learn to explain that decimal numbers with tenths can be represented as addition.

Key Notes

• Use part-part-whole models to partition decimal numbers into the whole number and fraction parts.
• Number with whole number and decimal parts can be represented as addition and subtraction equations.
• The whole number and decimal parts of a number can be represented on a number line.

Vocabulary To Learn

• Decimal number: A decimal number has a decimal point followed by digits that show the fractional part.
• Partition / partitioning: Partitioning is the act of splitting an object or value down into smaller parts..
• Equation: An equation is used to show that one number, calculation or expression is equal to another. For example: 3 + 4 = 7
• Expression: An expression contains one or more values, where each value is separated by an operator. For example: 3 + 4

Common Mistakes To Avoid

• Pupils understand the equals sign as 'where the answer is' rather than equality between expressions.

3 Quick Questions (With Answers)

More Lessons In This Unit

• Explain that decimal numbers with tenths can be composed multiplicatively Study Guide
• Use knowledge of column addition and subtraction to calculate with decimal numbers Study Guide
• Use known facts and mental strategies to calculate with decimal numbers within and across a whole Study Guide
• Use representations to round a decimal number with tenths to the nearest whole number Study Guide