New
New
Year 2
Use near doubles within 10
I can use near doubles within 10.
New
New
Year 2
Use near doubles within 10
I can use near doubles within 10.
Lesson details
Key learning points
- We can use double facts to solve near-double calculations.
- We can double the smaller addend and add 1 If 4 + 4 = 8, then 4 + 5 is one more than 8, which is 9
- We can double the larger addend and subtract 1 If 5 + 5 = 10, then 4 + 5 is one less than 10, which is 9
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.
Keywords
Double/ Doubling - To become twice as many.
Near-double - A near-double is a number close to a double.
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 (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Video
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Starter quiz
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6 Questions
Q1.
Which sentence describes what the bar model is representing?
![An image in a quiz](/_next/image?url=https%3A%2F%2Foaknationalacademy-res.cloudinary.com%2Fimage%2Fupload%2Fv1710759381%2Fzxkqj1h3jootimzi3da8.png&w=1920&q=75)
Double 2 is 4
Double 4 is 8
Q2.
What is being shown on this number frame?
![An image in a quiz](/_next/image?url=https%3A%2F%2Foaknationalacademy-res.cloudinary.com%2Fimage%2Fupload%2Fv1710759382%2Fwipug53tfot5adllkrzo.png&w=828&q=75)
Double 4 is 8
Q3.
Half of 8 is 3 True or False?
True
Q4.
What halving equation is represented by the bar model?
![An image in a quiz](/_next/image?url=https%3A%2F%2Foaknationalacademy-res.cloudinary.com%2Fimage%2Fupload%2Fv1709299114%2Ffk980einugktr4anl0fu.png&w=828&q=75)
Half 8 is 4
Half 6 is 3
Half 3 is 6
Q5.
Tick all the correct statements.
If I know double 3 is 6, then I know half of 3 is 6
Q6.
There were 6 birds in the tree. Half of them flew away. How many birds flew away?
6
5
4
Exit quiz
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6 Questions
Q1.
Complete the sentence. If double 4 is 8, then 4 + 5 is one __________
less
half
Q2.
Which sentence describes the representations.
![An image in a quiz](/_next/image?url=https%3A%2F%2Foaknationalacademy-res.cloudinary.com%2Fimage%2Fupload%2Fv1710759377%2Fv8kda7crxmq8nir9w5lb.png&w=640&q=75)
Double 1 is 2, add 1 is 3
Double 4 is 8, add 1 is 9
Q3.
Which sentence describes the representations?
![An image in a quiz](/_next/image?url=https%3A%2F%2Foaknationalacademy-res.cloudinary.com%2Fimage%2Fupload%2Fv1710759377%2Fngzo9q6kb5yb5h8dgynb.png&w=1080&q=75)
Double 3 is 6, subtract 1 is 5
Double 2 is 4, subtract 1 is 3
Q4.
Which double facts could help to solve 3 + 4 = ?
2 + 2
5 + 5
Q5.
Whose sum is 3?
![An image in a quiz](/_next/image?url=https%3A%2F%2Foaknationalacademy-res.cloudinary.com%2Fimage%2Fupload%2Fv1710759380%2Fz6fbhh3cjsj8bstsrwgn.png&w=1200&q=75)
![An image in a quiz](/_next/image?url=https%3A%2F%2Foaknationalacademy-res.cloudinary.com%2Fimage%2Fupload%2Fv1710759378%2Fmf3kjswu7jxydgv5nxno.png&w=640&q=75)
![An image in a quiz](/_next/image?url=https%3A%2F%2Foaknationalacademy-res.cloudinary.com%2Fimage%2Fupload%2Fv1710759379%2Fccpgmljakyz24kgjlvwl.png&w=384&q=75)
![An image in a quiz](/_next/image?url=https%3A%2F%2Foaknationalacademy-res.cloudinary.com%2Fimage%2Fupload%2Fv1710759380%2Fxawcgmv3oqoj1v2f4hsh.png&w=640&q=75)
Q6.
There were 4 bananas and 5 apples in the bowl. How many pieces of fruit were there in total?
7
8
10