New
New
Year 2

Solve problems involving multiples of ten

I can solve problems involving multiples of ten.

New
New
Year 2

Solve problems involving multiples of ten

I can solve problems involving multiples of ten.

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Lesson details

Key learning points

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

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.

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?'

Cycle 2 contains some interesting puzzles which children may find challenging. Offer completed puzzles to investigate the rules of each to scaffold understanding. Allow lots of opportunity for pupil discussion and reasoning to explain their ideas.
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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6 Questions

Q1.
Aisha shows an answer on a place value chart. Which equation could she have been answering?
An image in a quiz
70 − 10 =
30 + 10 =
Correct answer: 10 + 0 =
Correct answer: 90 − 80 =
Q2.
Complete the equation. tens + 6 tens = 8 tens.
Correct Answer: 2, two
Q3.
Complete the equation. tens − 5 tens = 2 tens.
Correct Answer: 7, seven
Q4.
What is the missing part in this part-part-whole model?
An image in a quiz
Correct Answer: 40, forty
Q5.
What equation is being represented by this bar model?
An image in a quiz
60 + 50 = ___
Correct answer: 60 − 50 = ___
___ + 60 = 50
Correct answer: 60 − ___ = 50
50 − 60 = ___
Q6.
In this pyramid, two blocks add together to make the block above it. What is the missing number at the top of the pyramid?
An image in a quiz
Correct Answer: 13, thirteen

6 Questions

Q1.
In this pyramid, two blocks add together to make the block above it. What is the missing number at the top of the pyramid?
An image in a quiz
Correct Answer: 90, ninety
Q2.
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 =
Correct answer: 7 − 2 =
2 − 7 =
2 + 7 =
Q3.
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?
An image in a quiz
Correct Answer: 10, ten
Q4.
Sofia has 70 p but loses 30 p from a hole in her pocket. How much does she have left? pence.
Correct Answer: 40, 40 p
Q5.
Andeep buys a pencil for 30 p and a toy car for 70 p. How much has he spent? pence.
Correct Answer: 100, 100 p, £1
Q6.
The arrows show the total for the row and column. What number is missing from the middle of this cross?
An image in a quiz
Correct answer: 10
20
30
40
50