Use known addition and subtraction facts within 10 to solve problems | Maths

Starter quiz

If double 3 is 6, then 4 + 3 is one ____

more ✓

less

half
Which double fact would help to solve this problem? 5 + 4 = ?

2 + 2

4 + 4 ✓

3 + 3

5 + 5 ✓
Which sentence describes the representations?

Double 2 is 4, add 1 is 5

Double 1 is 2, add 1 is 3

Double 4 is 8, add 1 is 9 ✓
Which sentence describes this representation?

Double 3 is 6, subtract 1 is 5 ✓

Double 4 is 8, subtract 1 is 7

Double 2 is 4, subtract 1 is 3
Who is describing number 5?
There were 4 sheep and 3 cows in the yard. How many animals were there in total?

9

8

7 ✓

Exit quiz

Which of these equations represents a double?

4 + 5 =

5 + 2 =

3 + 3 = ✓

6 - 3 =
Which of these equations represents a near-double?

4 + 5 = ✓

5 + 2 =

3 + 3 =

6 - 3 =
What would be the best strategy for solving 8 - 2 = ?

One less

A near-double

The even number before ✓
Match the equation with the best strategy for finding the sum or difference.

Near-double

⇔

5 + 4 = ✓

One more

⇔

3 + 1 = ✓

Next odd/even number

⇔

6 + 2 = ✓

Odd/even number before

⇔

7 - 2 = ✓
Sam thinks that all these equations can be solved using the next odd/even number strategy. Tick those that can to help you discuss whether or not she is correct.

7 + 2 = ✓

4 + 2 = ✓

2 + 5 = ✓

2 + 1 = ✓
Sam had 7 cookies. This is two more than Aisha has. How many does Aisha have?

9

7

5 ✓

3

Worksheet

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Lesson Details

Key learning points

Recall addition and subtraction facts within 10 to solve problems.
Use strategies like near-doubles to solve problems involving numbers within 10
Use one more, one less or two more, two less to solve problems.

Common misconception

Children may still make errors when selecting the most appropriate strategy to aid their recall e.g. they may see 7 - 2 = and count back in ones rather than seeing that 5 is the odd number before 7

Always talk about the equation to solve, modelling thinking processes e.g. 'I can see... so I know.... The table in the first learning cycle, organising facts by the strategies used to recall them, can be displayed within the learning environment.

Keywords

Strategy - A plan, a method or a way to solve a problem.