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Lesson 13 of 15
Use knowledge of doubles to calculate near-doubles
I can use knowledge of doubles to calculate near-doubles.
Lesson 13 of 15
New
New
Use knowledge of doubles to calculate near-doubles
I can use knowledge of doubles to calculate near-doubles.
Lesson details
Key learning points
- Knowing double facts helps you to calculate near-doubles.
- If 2 + 2 is equal to 4, then 2 + 3 is equal to one more than 4 which is 5
Keywords
Double - To become twice as many.
Near-double - A near-double is a number close to a double.
Addends - Any of the numbers that are added together.
Common misconception
Children could try to apply this idea to other near-double facts that may be more easily solved using other strategies.
0 + 1 and 1 + 2 are near-doubles, but these are more easily solved using the 'one more'/ 'one less' strategy. Explore this together before leading children to the most efficient strategy for calculating.
Here, two new facts are introduced that can be learnt using near-doubles, 3 + 4 and 4 + 5 (and their commutatives). Note, 2 + 3 (and 3 + 2) has been covered in 'adding two', but some may find it easier to relate this fact to 'near double two' rather than the 'odd number after' 3
Teacher tip
Licence
This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
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Prior knowledge starter quiz
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6 Questions
Q1.When we add two equal addends, we are
When we add two equal addends, we are
halving
Q2.What number would complete this bar model?
What number would complete this bar model?
Q3.Tick all the correct statements.
Tick all the correct statements.
Double 4 is 2
Q4.What is the missing number? Half of is 3
What is the missing number? Half of is 3
8
7
5
Q5.Who is correct?
Who is correct?
Sam
Q6.Sam is 8 years old. She is double the age of her brother. How old is her brother?
Sam is 8 years old. She is double the age of her brother. How old is her brother?
3 years old
1 years old
2 years old
Assessment exit quiz
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6 Questions
Q1.What near double is the representation showing?
What near double is the representation showing?
6 + 5
5 + 4
Q2.What near double is the representation showing?
What near double is the representation showing?
3 + 4
4 + 5
Q3.Which of these double facts would help to solve this near-double problem? 2 + 3 =
Which of these double facts would help to solve this near-double problem? 2 + 3 =
1 + 1
5 + 5
Q4.Finish the sentence. Near doubles always have
Finish the sentence. Near doubles always have
two odd addends.
two even addends.
Q5.What is the missing number in this bar model?
What is the missing number in this bar model?
3
2
5
Q6.Jacob ran 4 laps of the track. Then he ran another 3 laps. How many laps did he run in total?
Jacob ran 4 laps of the track. Then he ran another 3 laps. How many laps did he run in total?