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Step 27 Lesson 2

Step Twenty-Seven
🎬 year 2 week 27 lesson 01
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Addition and Subtraction

Objectives

To count up to find a difference between two amounts of money.

Resources

Abacus Workbook 3 | Hit the Button (TopMarks) | Lines of 15 and 17 on ITP Difference (Mathsframe) | 0 to 20 beaded line | 📄 0-20 number cards

Vocabulary

count up | change | difference

Today's Lesson

Introduction

Before you start the lesson, watch this Recap Video with your student.

To keep mental recall of times tables facts fresh, ask your student to access Hit the Buttonand select 10x tables, 5x tables and 2x tables.  

ACCESS - Hit the Button (TopMarks)

Challenge your student to play each of these times tables twice through, aiming to beat their score on the second go.  

Note that currency can be changed to suit your local currency, if desired. 

Say:  

  • Matthew had £17 birthday money. He spent £15 on an art set. How could we work out how much money he has left?

Mark 17 on the 0–20 beaded line. Explain that we could count back 15 to find how much he had left, but that would take a long time and we might make a mistake. Instead we count up from 15 to 17 to find the difference between these amounts, because it is quicker and easier. 

Cross out the section of line from 0 to 15 and say: ‘He’s spent £15, how much is left?’ 

Draw a hop from 15 to 17, labelling it ‘2’. 

Ask: 

  • What number sentence can we write?

Record: £17 – £15 = £2.  

Then challenge your student by asking: 

  • What if he had only spent £2? How could we work that out?

Explain that 2 is an easy number to count back, and we can see this using a website resource.  

Show lines of 15 and 17 on ITP Difference.

ACCESS - ITP Difference (Mathsframe)

Click the ‘play’ button so that the two lines move on top of one another and point out the extra yellow counters. Continue to click to show the two number lines, then them merging, the hop, and then the number sentence.  

Ask: 

  • What if Matthew had spent £14?

Say: 

  • That would be a lot to count back. How could we work it out?

Agree that we could find the difference between 14 and 17 by counting up.

Main Activity

Shuffle a set of 10–20 number cards (use cards from 📄 0-20 number cards), turn them upside down and take two cards. 

The larger number is how much money they have in pounds, the smaller number the amount they spend.  

Your student should then use 0 to 20 beaded linesto help them to find the difference between the two cards by counting up and record the related subtractions. 

Ask them to come up with money and change word problems about the numbers they have picked.  

Complete the Main Activity but use 10–30 number cards.

Note: Some differences may be more efficiently found by counting back (for example, 29 – 11) or by using place value (for example, 25 – 10).

Extra Support

Complete the activity as above but use 10-15 number cards so that the differences are smaller.

Extra Challenge

Complete the Main Activity but use 10–30 number cards. 

Note: Some differences may be more efficiently found by counting back (for example, 29 – 11) or by using place value (for example, 25 – 10).

Workbook

To help your student build upon their learning from today, please ask them to complete the activities on page 7 of Abacus Workbook 3.

Citations

[1] www.topmarks.co.uk [2] mathsframe.co.uk