Subtraction With Decimals

Objectives

To subtract numbers involving decimals using an appropriate method, using column subtraction and regrouping only if necessary.

Resources

Abacus 4 Textbook 2 | Squared paper | Subtracting Decimals video | Add and Subtract Decimals (MyMaths)

Today's Lesson

Main Activity

For a mental warm up, again ask some random counting forward and backwards problems in groups of 25s and 50s, but not starting from multiples of 10.

For example:

Count back in 25s starting from 175.

Turn to page 66 in Abacus 4 Textbook 2.

This video will show a tip for helping with subtracting from multiples of £10 using the column method which avoids lots of exchanging.

Once your student is comfortable with choosing and using a method they’re comfortable with, ask them to copy and complete the calculations on the page. Remind your student to answer word problem questions with both the unit of measure and a sentence answer.

Citations

[1] app.mymaths.co.uk