New
New
Year 1

Using known addition and subtraction facts

I can use known addition and subtraction facts within 10 when solving problems.

New
New
Year 1

Using known addition and subtraction facts

I can use known addition and subtraction facts within 10 when solving problems.

Lesson details

Key learning points

  1. In order to solve a problem, we must visualise and represent it. Once we can see a problem, we know what to calculate.
  2. We can represent a problem in many different ways, including as bar models, ‘First, Then, Now’ models and equations.
  3. To calculate a solution, we can use a range of strategies.
  4. We can use our knowledge of addition facts to help us solve subtraction facts.
  5. We can use our knowledge of subtraction facts to help us solve addition facts.

Common misconception

Children may recall a fact incorrectly, deploying the wrong strategy to calculate.

Revisit strategies for calculating within 10 including using knowledge of doubling, near-doubles, odd and even numbers and one more and one less. Spend time practising recall of these facts beyond the lesson.

Keywords

  • Represent - Showing something or standing for something.

  • Calculate - To work out an answer.

  • Efficient - Not wasting time or effort. An efficient strategy is one we can carry out easily.

  • Strategy - A plan or method to achieve a specific goal.

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).

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6 Questions

Q1.
Match the numbers that sum to 10
Correct Answer:9,1

1

Correct Answer:5,5

5

Correct Answer:3,7

7

Correct Answer:6,4

4

Correct Answer:2,8

8

Q2.
Which of these expressions are equal to 8?
Correct answer: 10 - 2
Correct answer: 4 + 4
5 + 4
Correct answer: 9 - 1
Q3.
Which of these numbers are odd numbers?
Correct answer: 7
8
Correct answer: 9
10
Correct answer: 11
Q4.
Match to complete each sentence sentence.
Correct Answer:One more than 19 is,20

20

Correct Answer:One less than 16 is,15

15

Correct Answer:Two more than 14 is,16

16

Correct Answer:Two less than 15,13

13

Q5.
Which equations does this image represent?
An image in a quiz
Correct answer: 3 + 7 = 10
Correct answer: 7 + 3 = 10
7 - 3 = 10
Correct answer: 10 - 3 = 7
Q6.
Match the expressions to their description.
Correct Answer:3 + 8,greater than 10

greater than 10

Correct Answer:6 + 4,equal to 10

equal to 10

Correct Answer:3 + 6,less than 10

less than 10

6 Questions

Q1.
First, there were 5 red cars in the car park. Then, 2 blue cars entered the car park. How many cars were in the car park altogether?
Correct Answer: 7
Q2.
Complete the missing part of the story. First, there were 6 pencils in a pot. Then, . Now, there are 4 pencils in the pot.
An image in a quiz
Correct answer: 2 pencils were taken out.
2 more pencils were put into the pot.
4 pencils were taken out.
Q3.
Which equation could represent the cubes within this bar model?
An image in a quiz
Correct answer: 3 + 7 = 10
7 - 3 = 4
Correct answer: 7 + 3 = 10
7 - 4 = 3
Q4.
Look at the image of the robots. True or false, the equations are related.
An image in a quiz
Correct answer: True
False
Q5.
This story represents books on a bookshelf. Which equation matches the story?
An image in a quiz
5 + 3 = 8
Correct answer: 8 - 3 = 5
8 - 5 = 3
Q6.
Match the related facts.
Correct Answer:3 + 2 = 5,5 - 2 = 3

5 - 2 = 3

Correct Answer:6 + 4 = 10,10 - 4 = 6

10 - 4 = 6

Correct Answer:1 + 7 = 8,8 - 7 = 1

8 - 7 = 1

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