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

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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 + box. = 12 and  box.  – 5 = 8.

 

Teaching resources for this Achievement Objective
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Names and numbers

Level Two
Number and Algebra
Problem solving activities
This problem solving activity has a number (addition and subtraction) focus.
  • Perform addition and multiplication with 10s and 5s.
  • Devise and use problem solving strategies to explore situations mathematically (e.g. be systematic, draw a picture).
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Nine plus facts

Level Two
Number and Algebra
The purpose of this activity is to support students using their knowledge of teen numbers to recall addition facts with nine.
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Number Cards

Level Two
Number and Algebra
Numeracy activities
In this activity the students play a card game to practise their addition and subtractions facts.

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

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Number Cards

Level Two
Number and Algebra
In this activity the students play a card game to practice their addition and subtractions facts.

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

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Number lines and bead strings

Level Two
Number and Algebra
Units of Work
In this unit five-based bead strings and number lines are used to solve addition and subtraction problems. The aim is to get students that use an early additive strategy to solve problems using a tidy number strategy with 10.
  • Solve addition problems like 8 + 4 = by going 8 + 2 = 10, 10 + 2 (more) = 12.
  • Solve subtraction problems like 14 – 6 by going 14 – 4 = 10, 10 – 2 (more) = 8.
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One Liner

Level Two
Number and Algebra
Figure It Out activities
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 basic facts

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Pick a Plate

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

use addition and subtraction facts

use mental strategies to add numbers

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Pocket facts

Level Two
Number and Algebra
Numeracy activities
This activity encourages students to recall their basic addition and subtraction facts.

recall addition and subtraction facts for the numbers 0-9.

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Pocket facts

Level Two
Number and Algebra
This activity encourages children to recall their basic addition and subtraction facts.

Recall addition and subtraction facts for the numbers 0-9.

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Quick Add

Level Two
Number and Algebra
Figure It Out activities
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 the addition basic facts

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Quick Thinking.

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

use basic facts knowledge of addition and subtraction facts

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Smart doubling

Level Two
Number and Algebra
Units of Work
In this unit students are encouraged to abandon counting methods, in favour of using known doubles facts, to derive the answers to addition problems. Using doubles is more complex but more efficient.
  • Be able to recall instantly doubles from 1 + 1 to 9 + 9.
  • Use known doubles facts to work out addition problems mentally using part/whole reasoning.
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Something's Hiding!

Level Two
Number and Algebra
In this activity the purpose is to find out how many tens and ones blocks are hidden from a given total.

Solve subtraction problems

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Something's Hiding!

Level Two
Number and Algebra
Numeracy activities
In this activity the purpose is to find out how many tens and ones blocks are hidden from a given total.

solve subtraction problems

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Square of circles

Level Two
Number and Algebra
Problem solving activities
This problem solving activity has a number (addition and subtraction) focus.
  • 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).
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Stay on Line

Level Two
Number and Algebra
Figure It Out activities
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 the addition facts

know the subtraction facts

write addition and subtraction facts as equations

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Subtraction Game

Level Two
Number and Algebra
This game allows students to practice their subtraction skills.

Recall basic subtraction facts

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Subtraction Game

Level Two
Number and Algebra
Numeracy activities
This game allows students to practice their subtraction skills.

recall basic subtraction facts

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Super darts

Level Two
Number and Algebra
Problem solving activities
This problem solving activity has a number focus.
  • Apply number operations in combination to single digit numbers.
  • Work systematically to find the possible outcomes.
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Takeaway Numbers

Level Two
Number and Algebra
Figure It Out activities
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 subtraction facts

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Tennis Ball Addition

Level Two
Number and Algebra
Numeracy activities
The purpose of the activity is to practice addition basic facts

recall the basic addition facts

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Tennis Ball Addition

Level Two
Number and Algebra
The purpose of the activity is to practice addition basic facts

Recall the basic addition facts

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Testing Triangles

Level Two
Number and Algebra
Figure It Out activities
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.

use addition facts to solve puzzles

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Total Recall

Level Two
Level Three
Number and Algebra
Figure It Out activities
This is a level 2 and 3 number activity from the Figure It Out series. It relates to Stage 5 and 6 of the Number Framework.

practise basic facts

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Twenty-Seven

Level Two
Number and Algebra
Figure It Out activities
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.

use simple additive strategies to solve problems

use addition facts to solve problems