1. Number and place value

Lesson

Do you remember how to use models to represent place value ?

Use the least amount of blocks possible to make the number 530.

Worked Solution

Idea summary

A place value table is useful to find how many blocks are needed to make a number.

By remembering that each digit in our number is ten times larger than the place to its right, we can multiply or divide by 10.

Complete these number sentences.

a

9 \times 10 = ⬚

Worked Solution

b

90 \times 10 = ⬚

Worked Solution

c

900 \times 10 = ⬚

Worked Solution

d

9000 \times 10 = ⬚

Worked Solution

Idea summary

When we multiply by 10, our number becomes ten times bigger, so the digit moves to the next highest place, by moving left.

When we divide by 10, our number becomes ten times smaller. so the digit moves one place right.

uses mental and written strategies for addition and subtraction involving two-, three-, four and five-digit numbers

uses mental and informal written strategies for multiplication and division