Addition facts to 20 are the sums of pairs of whole numbers, including zero, whose total is no greater than 20; fluency reflects understanding of relationships such as commutativity, doubles, near-doubles, and decompositions that make ten, rather than treating each fact as unrelated. These facts support efficient mental calculation and subtraction reasoning; this scope does not include multi-digit addition, extended fact families, or generalized algebraic treatment.
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Detailed Explanation: Recall addition facts to 20
Addition facts to 20 are sums you can solve quickly in your head. Use relationships you know, such as making a ten.
Example: Find .
- Start with .
- Break into , because .
- Add to make ten:
- Finish adding:
So,
You can also remember that switching the addends does not change the sum: .
Learn by doing: Recall addition facts to 20
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Practice:
Addition - Whole Number - Within 20
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Download/Modify Free Grade 3 'Recall addition facts to 20' Worksheet
Print this free 'Recall addition facts to 20' worksheet to practice this skill away from the computer. Click 'Modify' to easily customize this worksheet to your exact needs.
This Worksheet Includes:
- Addition - Whole Number - Within 20
- Addition - Whole Number 1 digit + 1 digit, With Carry
- Addition - Whole Number 1 digit + 1 digit - Column, With Carry
- Addition - Whole Number - Doubles
- Addition - Whole Number - Near Doubles - Column
- Addition - Whole Number 1 digit + 1 digit, No Carry
- Addition - Whole Number - Within 10
- Addition - Whole Number - Within 5
Units Teaching This Skill
These adaptive units introduce, teach, or reinforce this skill (Recall addition facts to 20) through scaffolded problems that grow in difficulty as concepts are understood.