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

Elaboration on this Achievement Objective

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.

Teaching resources for this Achievement Objective

This is a level 2 number and algebra strand activity from the Figure It Out series. It relates to Stage 5 of the Number Framework A PDF of the student activity is included.

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

Figure It Out activities

Number and Algebra

Level Two

This is a level 2 number activity from the Figure It Out series. It relates to Stage 5 of the Number Framework. A PDF of the student activity is included.

know addition facts

Figure It Out activities

Number and Algebra

Level Two

This is a level 2 number activity from the Figure It Out series. It relates to Stage 5 of the Number Framework.

use addition facts to solve puzzles

Figure It Out activities

Number and Algebra

Level Two

Recall basic addition facts to 20 Investigate odd and even numbers Devise and use problem solving strategies (guess and check, act it out, draw a picture)

Problem solving activities

Number and Algebra

Level Two

This is a level 2 number activity from the Figure It Out series. It relates to Stage 5 of the Number Framework.

know addition facts know subtraction facts

Figure It Out activities

Number and Algebra

Level Two

The purpose of this activity is to engage students in using their number knowledge and skills to solve a problem requiring partitioning.

Rich learning activities

Number and Algebra

Level Two

Recall addition and subtraction facts to 20.

Numeracy activities

Number and Algebra

Level Two

This is a level 2 number activity from the Figure It Out series. It relates to Stage 5 of the Number Framework. A PDF of the student activity is included.

know addition facts

Figure It Out activities

Number and Algebra

Level Two

Use calculators to explore multiples of numbers to a 1000 Identify number patterns in multiples. Devise and use problem solving strategies

Problem solving activities

Number and Algebra

Level Two

This is a level 2 number activity from the Figure It Out series. It relates to Stage 5 of the Number Framework.

use addition facts

Figure It Out activities

Number and Algebra

Level Two

This is a level 2-3 activity from the Figure It Out series. A PDF of the student activity is included.

Figure It Out activities

Number and Algebra

Level Two

Recall addition and subtraction facts to 20.

Numeracy activities

Number and Algebra

Level Two

Recall addition and subtraction facts to 20.

Numeracy activities

Number and Algebra

Level Two

The purpose of this activity is to engage students in applying their number knowledge and strategies to solve a problem.

Rich learning activities

Number and Algebra

Level Two

This is a level 2 number activity from the Figure It Out series. It relates to Stage 5 of the Number Framework. A PDF of the student activity is included.

know addition facts

Figure It Out activities

Number and Algebra

Level Two

know addition facts

Figure It Out activities

Number and Algebra

Level Two

know addition facts know subtraction facts

Figure It Out activities

Number and Algebra

Level Two

This activity provides students with a fun, game context in which to practice their addition skills. It also introduces concepts of probability.

perform addition calculations using numbers 1-6

Numeracy activities

Number and Algebra

Level Two

know doubles and halves up to 20

Figure It Out activities

Number and Algebra

Level Two

Recall addition facts Know the idea of, and be able to construct, magic squares.

Problem solving activities

Number and Algebra

Level Two

use addition facts to solve addition problems

Figure It Out activities

Number and Algebra

Level Two

This unit follows naturally from the Smart Doubling unit. In this unit students are encouraged to further develop part/whole mental methods by using the strategy of "make a ten".

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.

Units of Work

Number and Algebra

Level Two

Recall addition and subtraction facts to 20.

Numeracy activities

Number and Algebra

Level Two

Perform addition and multiplication with 10s and 5s. Devise and use problem solving strategies to explore situations mathematically . This problem uses be systematic, and draw a picture.

Problem solving activities

Number and Algebra

Level Two