Week 1: Rounding to the nearest 100
https://www.topmarks.co.uk/maths-games/rocket-rounding
Week 2: Dividing by 2, 5 & 10.
https://www.topmarks.co.uk/maths-games/mental-maths-train
Week 3: Missing number in a sequence within 1000
https://mathsframe.co.uk/en/resources/resource/42/sequences
Week 4: 2 & 4 times tables game
https://www.topmarks.co.uk/maths-games/hit-the-button
Week 5: 3 & 5 times tables game
https://www.topmarks.co.uk/times-tables/coconut-multiples
Week 6: Subtracting multiples of 100 http://www.snappymaths.com/subtraction/subm10m100/interactive/submult100f3dint/submult100f3dint.htm
Week 7: Adding multiples of 100
http://www.snappymaths.com/addsub/addsubp10/interactive/adding100int/adding100int.htm