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Addition Subtraction Problem Solving

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Addition Subtraction Problem Solving

Addition Subtraction Problem Solving

Children solving maths problems with counters and number lines

🍎 Part 1: Story Problems

1. Sarah has 15 stickers. She gives 7 stickers to her friend. How many stickers does Sarah have left?

Show your thinking: Draw a picture or use numbers to solve this problem.

Number sentence: _____ - _____ = _____

2. Tom collected 8 shells at the beach in the morning and 6 more shells in the afternoon. How many shells did Tom collect altogether?

Show your thinking: Draw a picture or use numbers to solve this problem.

Number sentence: _____ + _____ = _____

🧠 Part 2: Think Board Problem Solving

3. Use the Think Board to solve: 23 + 17

What do I know?

_________________________________


What do I need to find?

_________________________________


What strategy will I use?

_________________________________


My working:




My answer: ___________

4. Use the Think Board to solve: 45 - 18

What do I know?

_________________________________


What do I need to find?

_________________________________


What strategy will I use?

_________________________________


My working:




My answer: ___________

⚡ Part 3: Mental Strategy Practice

5. Use the near doubles strategy to solve these problems:

a) 7 + 8 = _____ (Think: 7 + 7 + 1)

b) 6 + 7 = _____ (Think: 6 + 6 + 1)

c) 9 + 8 = _____ (Think: 9 + 9 - 1)

6. Use bridging to 10 to solve these problems:

a) 8 + 5 = _____ (Think: 8 + 2 + 3)

b) 7 + 6 = _____ (Think: 7 + 3 + 3)

c) 9 + 4 = _____ (Think: 9 + 1 + 3)

7. Circle the best mental strategy for each problem:

For 8 + 9:

Near doubles (8 + 8 + 1)

Bridging to 10 (8 + 2 + 7)

Count on fingers

🛒 Part 4: Real Life Problem Solving

8. Shopping Problem: You have $50 to spend at the toy shop. You buy a puzzle for $23 and a book for $16. How much money do you have left?

Step 1: How much did you spend altogether?

_____ + _____ = $_____

Step 2: How much money is left?

$_____ - $_____ = $_____

9. Create your own problem: Write a story problem using addition or subtraction that a friend could solve.
10. Solve your own problem and show your working:

🎯 Part 5: Reflection

11. Which mental strategy do you find easiest to use? Tick all that apply:

Near doubles

Bridging to 10

Partitioning (breaking numbers into tens and ones)

Using a number line

12. Explain how you solved one of the problems today:
13. What would you like to practise more at home?

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