Solve problems involving multiples of ten | Maths | Quizalize & Oak National Academy

Starter quiz

Aisha shows an answer on a place value chart. Which equation could she have been answering?

70 − 10 =

30 + 10 =

10 + 0 = ✓

90 − 80 = ✓
Complete the equation. ______ tens + 6 tens = 8 tens.

'2' ✓
Complete the equation. ______ tens − 5 tens = 2 tens.

'7' ✓
What is the missing part in this part-part-whole model?

'40' ✓
What equation is being represented by this bar model?

60 + 50 = ___

60 − 50 = ___ ✓

___ + 60 = 50

60 − ___ = 50 ✓

50 − 60 = ___
In this pyramid, two blocks add together to make the block above it. What is the missing number at the top of the pyramid?

'13' ✓

Exit quiz

In this pyramid, two blocks add together to make the block above it. What is the missing number at the top of the pyramid?

'90' ✓
Tick the fact that can help solve this problem. Sam has 70 p in total. She has 20 p in her pocket and the rest in her purse. How much money does she have in her purse?

7 + 2 =

7 − 2 = ✓

2 − 7 =

2 + 7 =
In this pyramid, two blocks add together to make the block above it. What is the missing number in the pyramid shown with the question mark?

'10' ✓
Sofia has 70 p but loses 30 p from a hole in her pocket. How much does she have left? ______ pence.

'40' ✓
Andeep buys a pencil for 30 p and a toy car for 70 p. How much has he spent? ______ pence.

'100' ✓
The arrows show the total for the row and column. What number is missing from the middle of this cross?

10 ✓

20

30

40

50

Worksheet

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Lesson Details

Key learning points

Unitising and known facts help you to add and subtract multiples of ten
If 3 + 2 is equal to 5 then 3 tens + 2 tens is equal to 5 tens which is equal to 50
If 5 - 2 is equal to 3 then 5 tens subtract 2 tens is equal to 3 tens which is equal to 30

Common misconception

Children may rely on counting in tens rather than using known facts to add and subtract multiples of ten.

Encourage children to look for patterns as they add and subtract multiples of ten. Compare to the single-digit facts they know. Ask 'Is there a known fact that can help you?'

Keywords

Add - To find the total, or sum, by combining two or more parts (addends), or to increase an amount by adding another.
Subtract - To partition one part from another (the subtrahend from the difference), or to decrease an amount by taking an amount away.
Multiple of ten - A multiple of 10 is a number which can be made of groups of ten.