Explore mental and written strategies to solve problems
I can explore written and mental strategies to solve problems.
Explore mental and written strategies to solve problems
I can explore written and mental strategies to solve problems.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- Looking at the numbers involved and using number-sense supports us to know which strategy is more efficient.
- A number line is a useful mental strategy when it is obvious what to add or subtract.
- When using a formal written method the concept of constant difference can be used to make the calculation easier.
Keywords
Difference - The difference is the result of subtracting one number from another. It is how much one number differs from another - represented by how far apart they are on a number line.
Efficient - Being efficient means finding a way to solve a problem quickly whilst also maintaining accuracy.
Common misconception
Children may automatically use a formal written algorithm.
What do you notice about the numbers? What would you add/subtract to get to the nearest multiple of (a power of 10)? Can you represent this on a number line?
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).
Lesson video
Loading...
Starter quiz
6 Questions
1,000
1,001
1,003
1,005
999
50,000
60,000
70,000
75,000
100,000