Addition facts within 20 worksheets Grade 1
The addition facts with sums to 20, using counting on, doubles and making 10.
- Adding 4 within 20Add 4 to numbers up to 16 by counting on from the larger number.
- Adding 5 within 20Add 5 to numbers up to 15 by counting on or making 10 first.
- Adding 6 within 20Add 6 using doubles: 6 + 6 = 12, so 6 + 7 is one more.
- Adding 7 within 20Add 7 using doubles and near doubles.
- Adding 8 within 20Add 8 by making 10 first: 8 + 5 is 10 + 3.
- Adding 9 within 20Add 9 by making 10 first: 9 + 6 is 10 + 5.
- Doubles and near doublesUse a double you know to add the next fact: 7 + 7 = 14, so 7 + 8 = 15.
- Teen numbers plus onesAdd ones to a teen number: the ten stays and the ones are added.
- All addition facts to 20Mixed addition facts with sums up to 20.
- Adding three numbersAdd three one-digit numbers by finding two that make 10 first.
Unit packet
One two-sided worksheet for every topic, then the unit test, with the answer key at the back. Fresh each time.
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Unit test
Two problems from every topic. Pass it and move up to the next unit.
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