Filter by
Showing 1–6 of 58 results
Mastery
Add and subtract 10/20; extend to 11/21
In-depth Investigation: That Number Square! from nrich.maths.org
Mastery
Add pairs of 2-digit numbers
In-depth investigation: Five Steps to 50 from nrich.maths.org
Mastery
Add/subtract multiples of 10
In-depth Investigation: The Number Square! from nrich.maths.org