# NA2-3: Know the basic addition and subtraction facts.

This means students will know the basic addition facts from 0 + 0 = 0 to 9 + 9 = 18. So 4 + 1 = 5, 8 + 6 = 14, and 9 + 3 = 12 are all basic addition facts. The basic subtraction facts are the subtraction equivalent of the addition facts, so 5 – 1 = 4, 5 – 4 = 1, 12 -3 = 9 and 12 – 9 = 3 are all examples. It is important that students understand the commutative property of addition (for example, 4 + 7 = 7 + 4), and the inverse nature of addition and subtraction (for example, 6 + 7 = 13 so 13 – 7 = 6), as a foundation for more difficult problems, as well as a way to connect basic facts. Students also need to encounter the unknown in different positions within their basic facts, for example, 4 + = 12 and – 5 = 8.

know addition facts

write additon facts as equations, e.g 2 + 7 =

know addition facts

use addition facts to solve puzzles

know addition facts

know subtraction facts

Recall addition and subtraction facts to 20.

know addition facts

use addition facts

Recall addition and subtraction facts to 20.

Recall addition and subtraction facts to 20.

Recall doubles to 20.

know addition facts

know addition facts

know addition facts

know subtraction facts

perform addition calculations using numbers 1-6

know doubles and halves up to 20

use addition facts to solve addition problems

- Demonstrate automatic recall of all pairs of single digit addition facts whose total is 10 or less.
- Use the mental strategy "make a ten" for addition problems.
- Use the most efficient mental strategy for a given problem.

Recall addition and subtraction facts to 20.

Create and solve number problems using the basic operations of addition and subtraction.

create and solve number problems using the basic operations of addition and subtraction.