Using known addition and subtraction facts | Maths | Quizalize & Oak National Academy

Starter quiz

Match the numbers that sum to 10

9

⇔

1 ✓

5

⇔

5 ✓

3

⇔

7 ✓

6

⇔

4 ✓

2

⇔

8 ✓
Which of these expressions are equal to 8?

10 - 2 ✓

4 + 4 ✓

5 + 4

9 - 1 ✓
Which of these numbers are odd numbers?

7 ✓

8

9 ✓

10

11 ✓
Match to complete each sentence sentence.

One more than 19 is

⇔

20 ✓

One less than 16 is

⇔

15 ✓

Two more than 14 is

⇔

16 ✓

Two less than 15

⇔

13 ✓
Which equations does this image represent?

3 + 7 = 10 ✓

7 + 3 = 10 ✓

7 - 3 = 10

10 - 3 = 7 ✓
Match the expressions to their description.

3 + 8

⇔

greater than 10 ✓

6 + 4

⇔

equal to 10 ✓

3 + 6

⇔

less than 10 ✓

Exit quiz

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?

'7' ✓
Complete the missing part of the story. First, there were 6 pencils in a pot. Then, ______. Now, there are 4 pencils in the pot.

2 pencils were taken out. ✓

2 more pencils were put into the pot.

4 pencils were taken out.
Which equation could represent the cubes within this bar model?

3 + 7 = 10 ✓

7 - 3 = 4

7 + 3 = 10 ✓

7 - 4 = 3
Look at the image of the robots. True or false, the equations are related.

True ✓
False
This story represents books on a bookshelf. Which equation matches the story?

5 + 3 = 8

8 - 3 = 5 ✓

8 - 5 = 3
Match the related facts.

3 + 2 = 5

⇔

5 - 2 = 3 ✓

6 + 4 = 10

⇔

10 - 4 = 6 ✓

1 + 7 = 8

⇔

8 - 7 = 1 ✓

Worksheet

Loading worksheet ...

Presentation

Loading presentation ...

Video

Lesson Details

Key learning points

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