Calculating within 20
Why this, why now
In this unit pupils will add 3 addends. They will use a strategy such as finding 2 addends to total 10 or 2 numbers to bridge though 10.
Prior knowledge requirements
- Ardaydu waa inay yaqaanaan aasaaska maadada.
- Ardaydu waa inay awoodaan inay raacaan tilmaamo fudud.
Unit 5 / 19
Calculating within 20
In this unit pupils will add 3 addends. They will use a strategy such as finding 2 addends to total 10 or 2 numbers to bridge though 10.
15 lessons- Add three addends efficiently
- Add and subtract two numbers that bridge through 10
- Add two numbers that bridge through 10
- Add three addends efficiently by finding two addends that total 10
- Calculate the difference
- Explain that the addends can be added in any order
- Use a 'First, then, then, now' story to add three addends
- Compare the number of objects in two sets or difference between two measures.
- Calculate the difference in different contexts
- Use knowledge of calculating within 20 to solve problems involving statistics
- Explain what the difference is between consecutive numbers
- Use knowledge of calculating within 20 to solve problems
- Calculate the difference when information is presented in a pictogram
- Calculate the difference when information is presented in a bar chart
- Add three addends