New
New
Year 2
Partition 2-digit numbers in different ways
I can partition two-digit numbers in a range of ways.
New
New
Year 2
Partition 2-digit numbers in different ways
I can partition two-digit numbers in a range of ways.
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Lesson details
Key learning points
- Two-digit numbers can be partitioned into two or more parts.
- Known facts can be used to help partition a two-digit number into a multiple of ten and another part.
- The patterns in the tens can help to predict new equations.
- Known facts can be used to help partition both the tens and the ones in a two-digit number.
Keywords
Partition - To split a whole up into parts.
Common misconception
Children may think two-digit numbers can only be partitioned into tens and ones.
Use practical equipment to manipulate tens and ones on part-part-whole models to help children to understand the many ways that a number can be partitioned.
Partitioning two-digit numbers in different ways is important because it supports the recognition that no matter how a number is partitioned, the total value is conserved. This supports the development of mental methods which require the flexibility to rearrange numbers to calculate efficiently.
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).
Lesson video
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Starter quiz
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6 Questions
Q1.
79 − 40 = ? How many tens is being subtracted from 79 in this equation? tens
Q2.
Look at the image. Which equation does it represent?
82 − 40 =
82 − 20 =
Q3.
Match the known facts that will help to subtract multiples of 10
7 tens − 3 tens = 4 tens
60 − 40 = 20
80 − 50 = 30
Q4.
What could we do to help solve this equation? 72 − 40 =
Subtract 2 tens from 7 tens
Subtract 7 tens from 4 tens
Q5.
Which of these equations will have the same sum as 37 + 50?
73 + 50 =
Q6.
71 − 50 =
Exit quiz
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6 Questions
Q1.
Match each number to the number of tens it is composed of.
4 tens
7 tens
5 tens
8 tens
6 tens
Q2.
52 can be partitioned in different ways. Match the multiple of 10 with another number that sums to 52
2
12
22
32
42
Q3.
Which equation will come next in the pattern?
56 = 10 + 46
56 = 46 + 10
Q4.
Which of these equations show that 63 has been correctly partitioned into three parts?
63 = 20 + 30 + 3
Q5.
Which of these equations show that 47 has been correctly partitioned into three parts?
47 = 40 + 4 + 7
Q6.
What is the missing addend in this equation? 69 = 40 + 9 +
Additional material
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