Today can you explore subtraction facts?
Last week we looked at our addition facts. You can use these to help you with you subtraction facts.
I know that 9+1= 10, this means that 10-9=1 and 10-1=9. My number facts (or number bonds) to 10 also help me with my number facts to 20. I know that 10-1=9 so 20-1=19.
Challenge: Can you work systematically (in order) to make sure you have got them all?