New
New
Year 2

Count groups of ten and extra ones

I can count more efficiently by grouping objects into tens and then counting the groups of tens and extra ones.

New
New
Year 2

Count groups of ten and extra ones

I can count more efficiently by grouping objects into tens and then counting the groups of tens and extra ones.

Lesson details

Key learning points

  1. Ten ones are equivalent to one ten.
  2. When counting larger groups, it is more efficient to group objects into tens, then count the tens and extra ones.
  3. We can work out how many there are by counting in ones, or by counting the groups of ten and extra ones.

Common misconception

Children may only think of 'ones' in terms of the extra ones after the tens have been grouped, so may fail to see 45, for example, as 45 ones as well as 4 tens and 5 ones.

When objects are grouped in tens, use deliberate errors and discussion to draw attention to the total number of ones represented by the number, so children are familiar with recognising both the extra ones and the total number of ones in a number.

Keywords

  • Digit - A single symbol used to make a numeral.

Ensure there are daily opportunities to count groups of objects in tens and ones, so number names can be linked with quantities. Place value arrows are also useful for supporting understanding of the structure of two-digit numbers.
Teacher tip

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.
Sort these numbers in the order you would say when counting forwards.
1 - 30
2 - 40
3 - 50
4 - 60
Q2.
How many tens can you see in the picture?
An image in a quiz
Correct Answer: 6
Q3.
Which of the following represents the number shown on the Gattegno chart.
An image in a quiz
Correct answer: 7 tens 4
5 tens 6
4 tens 7
Q4.
Laura has 50 counters. She wants to record this on the place value chart. Which place value chart is correct?
An image in a quiz
Correct Answer: An image in a quiz
An image in a quiz
An image in a quiz
Q5.
How many tens are in the number thirty?
Correct Answer: 3, three
Q6.
Match the numerals to the words that have the same value.
Correct Answer:fifty,50

50

Correct Answer:forty,40

40

Correct Answer:eighty,80

80

6 Questions

Q1.
Look at the picture and fill in the missing number. There are 7 groups of ten and extra ones.
An image in a quiz
Correct Answer: 6, six
Q2.
Which of the following shows ten?
Correct Answer: 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
Q3.
Which Gattegno chart represents the groups of tens and ones shown?
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
Q4.
Laura puts the pencils into groups of ten. She has 8 tens and 6 extra ones. If they were counted in ones, how many ones would there be altogether?
Correct Answer: 86
Q5.
Which place value chart represents the picture shown?
An image in a quiz
An image in a quiz
Correct Answer: An image in a quiz
An image in a quiz
Q6.
Match the words to the numerals that have the same value.
Correct Answer:fifty-six,56

56

Correct Answer:sixty-five,65

65

Correct Answer:thirty-two,32

32

Correct Answer:twenty-three,23

23