11th January 2021
Monday 11th January - Wednesday 13th January = Column Addition
Thursday 13th and Friday 14th of January = Column Subtraction
Column Addition
![Still image for this video](http://primarysite-prod-sorted.s3.amazonaws.com/athelney-primary-school/UploadedVideo/a4c1a8ea521c417280e0a30fd837a978/column-addition_zencoder/thumbs/frame_0000.png)
Monday 11th January - Wednesday 13th January = Column Addition
Thursday 13th and Friday 14th of January = Column Subtraction