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 calculators to explore multiples of numbers to a 1000.
- Identify number patterns in multiples.
- Devise and use problem solving strategies.
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
- Recall addition facts.
- Know the idea of, and be able to construct, magic squares.
use addition facts to solve addition problems
- Recall 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.