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How many are left?

Flynn and Dodly are practising their magic tricks. They are trying to make eggs, muffins and even guinea pigs disappear. Help our two friendly monsters work out how many should be left after their disappearing tricks.

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Addition: adding numbers from one to ten

Flynn and Dodly go camping. While on their camping adventure they investigate adding numbers from one to ten. Watch how they work out how many of each item they have altogether. The Flying Girl and Ben the Bilby also appear.

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Counting pirate treasure

Watch as a stingy pirate captain counts out wages in 'pieces of eight' (gold coins) for one of his crew. Watch as the pirate captain takes away pieces of eight for what he calls 'deductions'. See how much gold the crew member walks away with!

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Addition and subtraction of fractions

Here are some tips for adding and subtracting fractions. See how to ensure the denominators match. You'll use your knowledge of equivalent fractions too. Remember to write your answers in the simplest form.

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Elmo's ducks

Sing along with Elmo and his four quacking ducks. One by one the ducks go away. How many ducks are left? See if Elmo's ducks come back.

Teacher resource

Primary mathematics: open-ended tasks

These seven learning activities, which focus on 'open-ended tasks' using a variety of tools (software) and devices (hardware), illustrate the ways in which content, pedagogy and technology can be successfully and effectively integrated in order to promote learning. In the activities, teachers use investigations in order ...

Teacher resource

Mental computation: introduction

This is a teacher resource that is part of a wider series; it introduces a structured strategies-based approach to mental computation for primary level and provides four generic classroom activities that can be used to empower students to use, share and test strategies. The support material describes the content of the ...

Teacher resource

Mental computation: basic facts - addition and subtraction

This is a teacher resource that is part of a wider series; it develops a structured strategies-based approach to mental computation of the 242 basic mathematics facts at primary level. The resource provides 13 stimulating classroom activities that encourage students to use a wide variety of mental-computation strategies. ...

Teacher resource

Mental computation: two-digit whole numbers

This is a teacher resource that is part of a wider series; it provides a structured strategies-based approach to mental computation of two-digit whole number sums at primary level. It provides 14 classroom activities that enable students to apply appropriate mental-computation strategies to more challenging sums. The support ...

Teacher resource

Mental computation: fractions and decimals

This is a teacher resource that is part of a wider series; it provides a structured strategies-based approach to mental computation of problems involving common and decimal fractions for primary level. It provides nine classroom activities that enable students to develop mental-computation skills in sequence by building ...

Teacher resource

Number talks

Use these tasks and resources to provide opportunities for students to explain mental strategies for performing calculations. Present a number of mathematical statements for students to investigate whether they are true or false. As a further challenge include statements about percentages and improper fractions.

Interactive resource

The take-away bar: generate hard subtractions

Solve subtractions such as 87-29. Use a linear partitioning tool to help solve randomly generated subtractions. Learn strategies to do complex arithmetic in your head. Split a subtraction into parts that are easy to work with, work out each part and then solve the original calculation. This learning object is one in a series ...

Interactive resource

The take-away bar: go figure

This tutorial is suitable for use with a screen reader. It explains strategies for solving subtractions in your head such as 87-39. Work through sample questions and instructions explaining how to use linear partitioning techniques. Solve subtractions by breaking them up into parts that are easy to work with, work out each ...

Interactive resource

Bridge builder: triangles 1

Build bridges by adding triangular sections. Each section is made up of three beams. Make bridges in order of increasing widths (increasing by one section each time). Examine a table and graph of the total number of beams used in bridges of different sizes. Predict the number of beams needed to build a wider span. Describe ...

Tablet friendly (Interactive resource)

Fraction fiddle: hit the apple

Help an archer to hit an apple with his arrow. Build two fractions to make a total of one whole. Complete the numerators of both fractions (they may have fixed denominators). For example, work out how many quarters and how many eighths can be added together to total one whole. Look at fraction bars and a number line to ...

Interactive resource

The take-away bar: make your own easy subtractions

Solve subtractions such as 58-9. Use a linear partitioning tool to help solve your own subtractions. Learn strategies to do complex arithmetic in your head. Split a subtraction into parts that are easy to work with, work out each part and then solve the original calculation. This learning object is one in a series of five objects.

Interactive resource

The take-away bar: make your own hard subtractions

Solve subtractions such as 93-47. Use a linear partitioning tool to help solve your own subtractions. Learn strategies to do complex arithmetic in your head. Split a subtraction into parts that are easy to work with, work out each part and then solve the original calculation. This learning object is one in a series of five ...

Interactive resource

The take-away bar: generate easy subtractions

Solve subtractions such as 28-9. Use a linear partitioning tool to help solve randomly generated subtractions. Learn strategies to do complex arithmetic in your head. Split a subtraction into parts that are easy to work with, work out each part and then solve the original calculation. This learning object is one in a series ...

Teacher resource

Using 'Counting on, counting back' - Teacher idea

This Teacher idea uses a combination of games (both digital and non-digital) and hands-on tasks to explore sequencing whole numbers to 20, and solve addition and subtraction problems using 'counting on' and 'counting back' strategies. It includes reflections following the teaching of R11450 'Counting on, counting back - ...

Teacher resource

TIMES Module 2: Number and Algebra: addition and subtraction - teacher guide

This is a 29-page guide for teachers. The module introduces addition and subtraction of whole numbers.