Represent addition and subtraction of tens and ones with equations | Maths

Starter quiz

Match each number to the number that has an equal value.

4 tens 9

⇔

49 ✓

7 tens 6

⇔

76 ✓

58

⇔

5 tens 8 ✓

85

⇔

8 tens 5 ✓
Which bar model shows 47 partitioned correctly?
Lucas has some 10 p and some 1 p coins in his pocket. Altogether, he has 52 p in his pocket. How many of each coin does he have?

Two 10 p coins and five 1p coins.

Five 10 p coins and five 1 p coins.

Two 1 p coins and five 10 p coins. ✓
What is the missing part in the part-part-whole model?

4 tens

7 ones

4 tens

7 tens ✓
69 has been partitioned into tens and ones. What is the missing number? 69 can be partitioned into ___ and 9

'60' ✓
Izzy wants to buy the ball. She already has two 1 p coins. Which of the following shows how much more money she will need to buy the ball?

99 p

90 p ✓

9 p

19 p

Exit quiz

Which of the following equations are represented in this part-part-whole model?

35 = 30 + 5

53 = 50 + 3 ✓

53 = 3 + 50 ✓

50 = 53 + 3
Which part-part-whole model represents 50 + 6 = ?
What is the missing number in the sentence? There are ___ tens, which is 30, and 9 ones, which is 9 There is 39 altogether.

'3' ✓
Which of the following completes the equation correctly.

46

40 ✓

30
Match the equation to the correct missing number.

63 − ___ = 60

⇔

3 ✓

___ − 5 = 30

⇔

35 ✓

3 = ___ − 50

⇔

53 ✓
Use > , < or = to complete the equation.

> ✓

<

=

Worksheet

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Lesson Details

Key learning points

When tens and ones are combined to make a two-digit number, this can be represented it as an addition equation.
When a two-digit number is partitioned into tens and ones, this can be represented as a subtraction equation.

Common misconception

Children may fail to appreciate the importance of the equals sign in an equation, e.g. making errors such as 16 = 4 + 20, or confuse the value of the digits, making errors such as 43 = 4 + 30

Use the language of parts and whole to activate/link to prior learning. Encourage drawing of own part-part-whole models. Encourage children to spot errors and explain why they are are incorrect and to articulate their thinking around correct answers.

Keywords

Partition - To split a whole up into parts.
Combine - To put parts together to make a whole.
Part - A piece or section of a whole.
Whole - All of something; complete.