Addition and Subtraction

1) https://goo.gl/aNP2yQ Lots of KHANacademy videos and questions to help you improve and understand different strategies / ways to add and subtract

https://goo.gl/CVHBb6 Subtraction - drag the picture to the correct answer

https://goo.gl/dxiEHa Addition and Subtraction practice

IXL Level D Questions from sections E to J (start where you need to)

https://goo.gl/mp2Ykk - harder subtraction problems