Partition 2-digit numbers in different ways | Maths | Quizalize & Oak National Academy

Starter quiz

79 − 40 = ? How many tens is being subtracted from 79 in this equation? ______ tens

'4' ✓
Look at the image. Which equation does it represent?

84 − 20 = ✓

82 − 40 =

82 − 20 =
Match the known facts that will help to subtract multiples of 10

7 − 3 = 4

⇔

7 tens − 3 tens = 4 tens ✓

6 − 4 = 2

⇔

60 − 40 = 20 ✓

8 − 5 = 3

⇔

80 − 50 = 30 ✓
What could we do to help solve this equation? 72 − 40 =

Subtract 4 tens from 7 tens ✓

Subtract 2 tens from 7 tens

Subtract 7 tens from 4 tens
Which of these equations will have the same sum as 37 + 50?

50 + 37 = ✓

73 + 50 =

57 + 30 = ✓
71 − 50 = ______

'21' ✓

Exit quiz

Match each number to the number of tens it is composed of.

40

⇔

4 tens ✓

70

⇔

7 tens ✓

50

⇔

5 tens ✓

80

⇔

8 tens ✓

60

⇔

6 tens ✓
52 can be partitioned in different ways. Match the multiple of 10 with another number that sums to 52

50

⇔

2 ✓

40

⇔

12 ✓

30

⇔

22 ✓

20

⇔

32 ✓

10

⇔

42 ✓
Which equation will come next in the pattern?

56 = 10 + 46

56 = 20 + 36 ✓

56 = 46 + 10
Which of these equations show that 63 has been correctly partitioned into three parts?

63 = 50 + 10 + 3 ✓

63 = 40 + 3 + 20 ✓

63 = 20 + 30 + 3

63 = 3 + 30 + 30 ✓
Which of these equations show that 47 has been correctly partitioned into three parts?

47 = 40 + 5 + 2 ✓

47 = 40 + 4 + 7

47 = 3 + 40 + 4 ✓

47 = 1 + 6 + 40 ✓
What is the missing addend in this equation? 69 = 40 + 9 + ______

'20' ✓

Worksheet

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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.

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.

Keywords

Partition - To split a whole up into parts.