A digit is a single symbol used to make a numeral. A two-digit number uses two symbols to make one numeral.

The symbol used to represent the number of tens in a numeral.

The symbol used to represent the number of ones in a numeral.

Represent a number from 20 to 99

Maths

Explore the counting sequence for counting to 100 and beyond

Count groups of ten and extra ones

Count a large group of objects by counting tens and ones

Use a number line to position and estimate the numbers 20-99

In this unit pupils will explore the counting sequence for counting to 100 and beyond and represent the numbers from 20-99 in different ways including marking the position on a number line. They learn to represent 20-99 as a length. In the future unit pupils consolidate their counting across and on from 100. They will learn to represent a three-digit number up to 199 in different ways.

In the prior unit pupils extended their counting to 100 They explored pattern in counting, focused on the end of the decade and the start of the new decade numbers. In this unit pupils will explore the counting sequence for counting to 100 and beyond representing numbers from 20-99 in different ways including marking the position on a number line They will learn to represent 20-99 as a length.

In this unit pupils will explore the counting sequence for counting to 100 and beyond representing numbers from 20-99 in different ways including marking the position on a number line They will learn to represent 20-99 in the context of length.

Counting and representing the numbers 20 to 99

Which representation matches the number on the chart correctly?

 What do you notice about all of these numbers?  35   36   37   38

What do you notice about all of these numbers?  35    45    55    65

Laura is counting forwards in ones on her Gattegno chart. Which representation shows the number she will tap next?

Jun has these Base 10 blocks. Which of these numbers could he make?

True or False? 62 is the only number that can be made using 8 Base 10 blocks .  

Which of the following describes the picture?

There are 5 groups of ten and 3 more ones.

There are 3 groups of ten and 5 more ones.

Which of the following represents the same value as the one hundred square?

Which representation matches the place value chart?

I’m thinking of a number which is on the one hundred square. It has seven tens and more than six ones. Which of these numbers could I be thinking of?

I’m thinking of a number which is on the one hundred square. It has 6 ones and fewer than 3 tens. Which of these numbers could I be thinking of?

Represent a number from 20 to 99

Lesson outcome