Multiplication and Division

Objectives

To count in 10s and 2s.

To recognise and describe patterns.

Resources

Abacus Workbook 1 | counters | whiteboard and pen

Vocabulary

multiples of 10 | multiples of 2 | pattern

Today's Lesson

Introduction

Ask your student to count out loud in 2s:

2,4,6,8…how far can they go?

Can they find and circle these numbers on their 100 square?

What do they notice about each number? (each digit ends in an even number!)

Now as your student to count in 10s:

10,20,30,40

Can they find and circle these numbers on their 100 square?

What do they notice about all of these numbers? (each digit ends in a zero!)

Ensure you ask, ‘How do you know?’ and, ‘Why is that your answer?’ as much as possible, to encourage your student to explain their mathematical thinking.

Next, ask your student to think of a really big number. Write it down for them. Point out that even with big numbers like this, we can always tell if it is a multiple of 10 straight away by looking at the final digit!

Repeat this task with multiples of 2. Challenge your student to discover for themselves how we can always tell whether a number is multiple of 2.

The rule is: Multiples of 2 always end with either 0, 2, 4, 6 or 8.

Use the Interactive number grid to ask your student to highlight multiples of 10, and then multiples of 2. How quickly can they do this?

PRACTISE - Interactive Number Grid (Mathsframe)

Then, highlight a single multiple of 10 and ask them to highlight the multiples of 10 before and after that one. Repeat with multiples of 2.

Main Activity

Write out the following number patterns on a whiteboard.

Ask your student if they can complete them. They can use their 100 square to help them:

2, 4, 6, _, 10, _, 14, _

8, 10, _, 14, _, _, 20

8, 18, 28, _, 48, _, _

7, 9, _, 13, _, _, _

Afterwards, your student should make up their own counting in 10s or 2s patterns.

Workbook

To help your student to consolidate their learning from today, please ask them to complete the activities on pages 60 and 61 of Abacus Workbook 1.

Citations

[1] mathsframe.co.uk