Addition and subtraction up to 20Mixed exercises
Practise addition and subtraction sums up to 20
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Time per question:
Practise a mix of addition and subtraction sums up to 20 here. Set how much time you want to have to do the sum and how many sums you want to practise in a row. You can practise addition and subtraction up to 20 on this website, good luck. Some example sums are: 11 + 6 = 17 15 - 7 = 8 By lowering the number of seconds for each exercise, it becomes more difficult to give the right answer. This way you can slowly increase the difficulty level. Mixed addition and subtraction sums up to 20 are part of year five arithmetic. By completing the sums with a timer, it will help you practise for a timed test. You can also choose longer series of sums to do more exercises in a row.