Add and subtract two from odd numbers within 10 | Maths

Starter quiz

Match the equations that show that addition is commutative.
- 4 + 6 = 10
  
  ⇔
  
  6 + 4 = 10 ✓
- 8 + 2 = 10
  
  ⇔
  
  2 + 8 = 10 ✓
- 10 = 1 + 9
  
  ⇔
  
  10 = 9 + 1 ✓
- 10 = 7 + 3
  
  ⇔
  
  10 = 3 + 7 ✓
Match the numbers that are one more and one less.
- One more than 7 is
  
  ⇔
  
  8 ✓
- One less than 10 is
  
  ⇔
  
  9 ✓
- One more than 5 is
  
  ⇔
  
  6 ✓
- One less than 8 is
  
  ⇔
  
  7 ✓
Which of these numbers are consecutive?
- 9 and 8 ✓
- 3 and 5
- 6 and 7 ✓
What is the odd number that comes after 3?
- 1
- 5 ✓
- 7
What is the odd number that comes before 7?
- '5' ✓
Which equations does this bar model show?
- 10 = 7 + 3 ✓
- 7 - 3 = 10
- 3 + 7 = 10 ✓

Exit quiz

Which of these numbers are odd?
- 4
- 3 ✓
- 7 ✓
Which is the next odd number in the sequence?
- '9' ✓
The missing odd number on this number line is ______.
- '5' ✓
Which representation shows that 2 has been subtracted from this number?
What is the missing number in this part-part-whole model?
- '3' ✓
Sam has 3 metres of ribbon. She cuts 2 metres off to use to make bracelets. How many metres of ribbon are left? ______ metre.
- '1' ✓

Worksheet

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Presentation

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Lesson Details

Key learning points

Adding two to an odd number gives the odd number after.
Subtracting two from an odd number gives the odd number before.
When we count forwards in odd numbers, we add two more each time.
When we count backwards in odd numbers, we subtract two each time. The result is two less.

Common misconception

Children may incorrectly identify the odd number 'before' or 'after' the one given.

Provide practice in the form of missing number problems where children must identify the odd numbers before or after one given. Do this until fluent. Initially, allow children to use a number line. Remove this scaffold once feeling more confident.

Keywords

Odd - Any integer (not a fraction) that cannot be divided exactly by 2
Even - Any integer that can be divided exactly by 2 is an even number. The last digit is 0, 2, 4, 6 or 8
Two more -
Two less -