Addition and subtraction up to 20Mixed exercises
Practice addition and subtraction sums up to 20
Number of questions:
Time per question:
Practice 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 practice in a row. You can practice 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 fourth-grade arithmetic. By completing the sums with a timer, it will help you practice for a timed test. You can also choose longer series of sums to do more exercises in a row.