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Related topic ### Addition and subtraction level 2: combining groups

This set of online activities focuses on the development and consolidation of early ideas associated with addition and subtraction of whole number collections of objects. This is the second of seven levels in a series that progresses to addition and subtraction of six-digit whole numbers. Each level includes interactive ... ### Addition and subtraction level 5

This set of online activities focuses on the development and consolidation of ideas associated with addition and subtraction of whole numbers from concrete contexts to abstract settings including written algorithms to four digits. This is the fifth of seven levels in a series that progresses to addition and subtraction ... ### Addition and subtraction level 6: mental strategies

This set of online activities focuses on the development and consolidation of ideas associated with addition and subtraction of whole numbers from concrete contexts to abstract settings including written algorithms to five digits. This is the sixth of seven levels in a series that progresses to addition and subtraction ... ### Addition and subtraction level 7: strategies

This set of online activities focuses on the development and consolidation of ideas associated with addition and subtraction of whole numbers from concrete contexts to abstract settings including written algorithms to five digits. This is the last of seven levels in a series that progresses to addition and subtraction of ... ### Mapping a sea voyage: calculating distance

Scientists involved in the Two Bays Project describe data collection methods for their 20-day expedition around Port Phillip and Western Port bays. Watch this clip to view the route mapped out by the scientists. Use Google Maps to recreate the route and calculate the total distance travelled. ### 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. ### 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. ### 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! ### To plus or minus: that is the problem

How do we solve plus and minus maths problems? Watch how you can add and subtract numbers that have two digits, such as 56 and 42. See how to set out each problem to make it easy to solve. ### Plus and minus problems at a party

See how to use the plus, minus and equals signs. How can we find the answer to two simple problems about numbers of people at a party? First see how to use a number line to add two numbers. Next, see an easy way to subtract (take away). ### What's the total?

Use a number line to add two numbers. Then try another way to add things. See two groups of mugs. Find out how many mugs there are. Find the total by counting on from the first set of mugs. ### 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. ### Tips for carrying out mathematical operations

Need some help with addition, subtraction, multiplication and division? See how to set up the problem first, by aligning the units, tens and hundreds. Get some tips on carrying. Try working out the problems, then check your answers. ### Add and subtract fractions

Do you know how to add and subtract fractions? What about fractions like 1/4 and 1/3 that have different denominators? See what you need to do to the denominator before you can add or subtract fractions. You'll see another way to find an answer, too. ### Is this the earliest version of sudoku?

An ancient Chinese legend describes the origin of magic squares. It is a square with nine numbers, where each row, column and diagonal adds to 15. See how this fun mathematical puzzle, developed by the ancient Chinese, works. ### Funny money

What do you use money to buy? In this clip we look at Australian money. See the different coins and notes that make up our money system. We investigate if size, (in coins) does matter. Check out how many 5 cent pieces you need to make two dollars. We also look at some currencies used around the world. Find out which country ... ### Can you add and subtract numbers in hundreds?

Can you add two numbers that are both in the hundreds? Here's an example that uses 129 and 573. See how to carry the tens and hundreds. Also watch how to subtract two numbers that are both in the hundreds. This example uses 781 and 218. Take 218 away from 781. See how to do the tricky bit of 'carrying'. ### 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. ### Adding and subtracting numbers in the hundreds

Can you add two numbers that are both in the hundreds? Here's an example that uses 149 and 673. See how to carry the tens and hundreds. Also watch how to subtract two numbers that are both in the hundreds. This example uses 741 and 218. Take 218 away from 741. See how to do the tricky bit of 'carrying'. ### Adding two numbers

How many different ways can you think of to add two numbers to reach ten? Watch this video to learn them all!