Count in 10s (pre-requisite skills)
Add 20 (pre-requisite skills)
Children practise adding and subtracting multiples of 10 to/from 2-digit numbers using a 1-100 grid and Spider.
Children use a beaded line to solve addition and subtraction calculations. Some will find the missing number in a number sentence.
Adding and subtracting 10 using a 1-100 grid
In-depth investigation: Nines to Zero
Children repeatedly add 9 or 19 to numbers until they reach a multiple of 10. Look for patterns. Make and test predictions based on the patterns.
Children rehearse adding ‘nearly numbers’ using the strategy of adding the multiple of 10 and then subtracting 1.
Children use calculators to help them look for patterns when adding 9, 19, 29 and 39.