New
New
Year 2

Represent a number from 20 to 99

I can represent the numbers from 20 to 99 in different ways.

New
New
Year 2

Represent a number from 20 to 99

I can represent the numbers from 20 to 99 in different ways.

Lesson details

Key learning points

  1. The order in which tens and ones are arranged does not affect the value of the number.
  2. We can use the patterns in numbers to help us represent new numbers.

Common misconception

When representing two-digit numbers practically, children may start each number anew, instead of using what they know about number patterns to adapt existing representations.

Use the questions 'What's the same?' and 'What's different?' to draw attention to the patterns in number sequences and how these can be used. Link the abstract to the pictorial and concrete by drawing attention to what each digit represents.

Keywords

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

  • Tens digit - The symbol used to represent the number of tens in a numeral.

  • Ones digit - The symbol used to represent the number of ones in a numeral.

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

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6 Questions

Q1.
Which of the following describes the picture?
An image in a quiz
Correct answer: We have 6 groups of ten and 3 more ones.
We have 3 groups of ten and 6 more ones.
Q2.
Which of the following is true?
An image in a quiz
There are 5 groups of ten and 3 more ones.
Correct answer: There are 3 groups of ten and 5 more ones.
Correct answer: There are 35 ones.
There are 53 ones.
Q3.
Which of the following represents the same value as the one hundred square?
An image in a quiz
Correct answer: 53 ones
35 ones
57 ones
37 ones
Q4.
Which representation matches the place value chart?
An image in a quiz
An image in a quiz
Correct Answer: An image in a quiz
An image in a quiz
An image in a quiz
Q5.
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?
56
75
Correct answer: 78
Correct answer: 79
Q6.
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?
36
63
Correct answer: 26
Correct answer: 6

6 Questions

Q1.
Which representation matches the number on the chart correctly?
An image in a quiz
An image in a quiz
An image in a quiz
Correct Answer: An image in a quiz
An image in a quiz
Q2.
What do you notice about all of these numbers? 35 36 37 38
They are all odd numbers.
They all have the same ones digit.
Correct answer: They all have the same tens digit.
Q3.
What do you notice about all of these numbers? 35 45 55 65
They are all even numbers.
They are all greater than 40
Correct answer: They all have the same ones digit.
Q4.
Laura is counting forwards in ones on her Gattegno chart. Which representation shows the number she will tap next?
An image in a quiz
Correct Answer: An image in a quiz
An image in a quiz
An image in a quiz
An image in a quiz
Q5.
Jun has these Base 10 blocks. Which of these numbers could he make?
An image in a quiz
42
Correct answer: 34
15
Correct answer: 22
Q6.
True or False? 62 is the only number that can be made using 8 Base 10 blocks .
True
Correct answer: False