Add & Subtract using 20. Season 2 Episode 204 | 15m 59s Video has Closed Captions | CC. Practice adding and subtracting within 20 using a Double 10-frame & number line. Aired 11/30/2021 | Rating TV-Y ...

In this KS1 Maths article you'll learn what number lines are and how to add and subtract using them. We also have KS1 Maths videos, a quiz and lots of examples.