Salesbury this week!
Blogs PageNational Centre for Excellence in the Teaching of Mathematics (NCETM)
These lessons cover an important concept in addition and subtraction. The videos begin with a simple idea, but quickly move on to applying the idea to more difficult calculations.
Follow this link:
https://www.youtube.com/playlist?list=PLQqF8sn28L9z1W52kmapUxEwbLiaFs5oM