Starter 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?- '50' ✓
What is the missing part in this part-part-whole model?- '20' ✓
What is the missing part in this bar model?- '20' ✓
- What is the missing part in this equation? 50 − ______ = 10
- '40' ✓
- Andeep buys a pencil for 20 p and a toy car for 60 p. How much has he spent? ______ pence.
- '80' ✓
- Sofia has 60 p in her pocket. The rest of her money is in her purse. She has 90 p altogether. How much money is in her purse? ______ pence.
- '30' ✓
Exit quiz
Lemons cost 20 p each and oranges cost 30 p each. What is the cost of one lemon and one orange? ______ p- '50' ✓
- A car has travelled 40 miles of a 70 mile journey. How many more miles does it need to go? ______ miles.
- '30' ✓
- A flower is 60 cm tall and a ladybird is 20 cm up. How much further does it need to climb to get to the top? ______ cm
- '40' ✓
Apples cost 10 p each and lemons cost 20 p each. Laura has 30 p. Which of the following can she buy?- Two lemons
- Two apples ✓
- One lemon and one apple ✓
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- Oranges cost 30 p and pears cost 40 p. What is the cost of two oranges and one pear? ______ p
- '100' ✓
Toy cars cost 60 p, a ball costs 10 p, a teddy costs 50 p and a boat costs 30 p. Andeep spends exactly 60 p. What could he have bought?- A toy car ✓
- Two boats ✓
- A boat and a teddy
- A boat and a ball
- A teddy and a ball ✓
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Worksheet
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Presentation
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Video
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. Make a list of known facts to refer to.
Keywords
Add - Finding the total, or sum, by combining two or more numbers.
Subtract - Taking one number away from another.
Multiple of ten - Groups of ten.
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