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Subtraction & Operations

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Planning notes

Level/Framework stage/Group: 4

Duration/Date: 3 weeks

Upper end

Focus Achievement Objectives
Carry out column addition and subtraction for whole numbers and decimals.
Choose critically from a range of mental strategies to solve addition and subtraction problems.
NA3-7: Generalise the properties of addition and subtraction with whole numbers.
NA4-2: Understand addition and subtraction of fractions, decimals, and integers.
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Adding and Subtracting Fractions

Level Five
Number and Algebra
Numeracy activities

Identify highest common factors and least common multiples.

Solve problems that involve adding and subtracting fractions.

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Properties of operations

Level Three
Number and Algebra
Units of Work
In this unit students work out their own generalisations of the properties of number operations through their exploration of addition, subtraction, multiplication and division.
  • Consolidate understanding of simple properties of addition, subtraction, multiplication and division.
  • Discover and use some more complex properties of addition, subtraction, multiplication and division.
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Take two

Level Three
Number and Algebra
Problem solving activities
This problem solving activity has an algebra focus.
  • Select and use a problem solving strategy (e.g. use equipment, work backwards, draw a picture).
  • Identify patterns used in solving the problem (multiples of 3).
  • Devise and use problem solving strategies (draw a picture, use equipment, think, work backwards).
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Staircase Capers

Level Three
Number and Algebra
Figure It Out activities
This is a level 3 algebra activity from the Figure It Out series.A PDF of the student activity is included.

explore patterns in numbers

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A Close Game

Level Three
Number and Algebra
Rich learning activities
The purpose of this activity is to engage students in using operations on whole numbers to investigate a given context.
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Properties of operations

Level Three
Number and Algebra
Units of Work
In this unit students work out their own generalisations of the properties of number operations through their exploration of addition, subtraction, multiplication and division.
  • Consolidate understanding of simple properties of addition, subtraction, multiplication and division.
  • Discover and use some more complex properties of addition, subtraction, multiplication and division.
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The Sieve of Eratosthenes

Level Five
Number and Algebra
Numeracy activities

Solve problems by finding the prime factors of numbers.

The files will download as a zip archive. Double-click on the archive file to extract the attachments on your computer.