Use addition and subtraction strategies to solve problems with multiples of 100 | Maths

Starter quiz

What is one hundred less than 1,000?
- '900' ✓
400 + 300 = ______
- '700' ✓
1,100 − 300 = ______
- '800' ✓
Which symbol could be used to make this correct?
- >
- <
- = ✓
Match each equation to the correct answer.
- 400 + 400 =
  
  ⇔
  
  800 ✓
- 900 + 200 =
  
  ⇔
  
  1,100 ✓
- 1,400 − 400 =
  
  ⇔
  
  1,000 ✓
- 1,200 − 300 =
  
  ⇔
  
  900 ✓
What number would make this equation correct?
- '800' ✓

Exit quiz

Five children played a game. Which two children scored exactly 900 points between them?
- Aisha
- Izzy ✓
- Jacob ✓
- Jun
- Sam
Five children played a game. Who scored 400 points more than Aisha?
- Aisha
- Izzy
- Jacob
- Jun ✓
- Sam
Five children played a game. Which two children scored a total of 1,300 points?
- Aisha
- Izzy
- Jacob ✓
- Jun
- Sam ✓
Five children played a game. Who scored 300 fewer points than Jun?
- Aisha
- Izzy ✓
- Jacob
- Jun
- Sam
Five children played a game. How many points did Jun and Sam score altogether?
- '1,500' ✓
Five children played a game. Three children scored 1,400 points between them. Which three children scored 1,400 points?
- Aisha ✓
- Izzy ✓
- Jacob
- Jun ✓
- Sam

Worksheet

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Presentation

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Lesson Details

Key learning points

Known facts help us to add and subtract multiples of 100
Unitising can help us to add and subtract multiples of 100
Adding and subtracting multiples of 100 can be represented in different ways.

Common misconception

For some questions in this lesson, there is more than one possible answer, but all may not provide the solution to the problem posed. Pupils may give the first (incorrect) answer that they find.

For the second task, encourage pupils to distinguish between questions that only have one solution and those that have multiple solutions. Modelling your thinking throughout the second learning cycle is key to supporting pupils to access the task.

Keywords

Multiple - A multiple is the result of multiplying a number by another whole number.