Play the mental maths train game and choose the addition and subtraction options. Follow the link below. It should look like this
https://www.topmarks.co.uk/maths-games/mental-maths-train
You could also try this fun game. I think you will like it. See how quickly you can answer the questions so you can develop your mental maths skills. It looks like this:
https://www.starfall.com/h/addsub/addsub-ladder/?sn=math1–math0
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