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Listed under:  Accuracy and precision

### Whole numbers level 5: four-digit numbers

This set of online activities focuses on the development and consolidation of number concepts to four digits and beyond. This is the fifth of seven levels in a series focusing on whole numbers to six digits. This level develops ideas about place value, rounding and number notation. Each level includes interactive drills ...

### Whole numbers level 7: six-digit numbers

This set of online activities focuses on the development and consolidation of number concepts to six digits and beyond. The complete set of activities consists of seven levels in a series focusing on whole numbers to six digits. This is the seventh level and contains ideas about place value, rounding and number notation ...

### Space debris: the accuracy of space lasers

In space there are thousands of human-made objects (satellites and space junk) orbiting Earth. To avoid collision with space debris, satellites are manoeuvred out of its path. Discover how space debris is tracked using lasers, and about accuracy's effects on the lifetime of the satellite. Find out, using trigonometry, the ...

### Engaging a Maths Class

The teacher draws upon her postgraduate research into student engagement in mathematics to develop innovative ways to support students in their learning. She encourages teamwork and the use of various resources to aid their thinking and learning. By helping students think about mathematics in ways that move beyond a simple ...

### How do you measure angles?

See how to use a protractor to measure angles. Watch how the correct placement of the protractor and reading the scale help to ensure accuracy.

### Have ruler, will measure!

Can you measure length using a ruler? Get some tips on how to measure in centimetres and convert to metres. Find out a way to estimate length when you don't need an exact measurement.

### How many glasses of juice will you get?

We buy many liquids in containers that hold a litre. How do we use millilitres to work out how many glasses of juice we'll get, or to describe containers that hold less than one litre? See how a scale that shows fractions of a litre can help you compare containers holding different amounts of liquid.

### Hopper: whole numbers

Help a frog to jump along a number line. Estimate the finishing point on a number line, after adding or subtracting multiples of whole numbers to a starting number. For example, 255+(10 x 4) = 295. Explore the patterns made on a counting grid and number line. Identify counting rules that match the pattern of 'landing spots' ...

### HOTmaths: exploring bearings

Use a map of New South Wales and a virtual compass to calculate the bearing of one town to another.

### Hopper: tenths

Help a frog to jump along a number line. Estimate the finishing point on a number line, after adding or subtracting multiples of tenths to a starting number. For example, 29.5+(12 x 0.2) = 31.9. Explore the patterns made on a counting grid and number line. Identify counting rules that match the pattern of 'landing spots' ...

### Hopper: ultimate

Help a frog to jump along a number line. Estimate the finishing point on a number line, after adding or subtracting multiples of decimal fractions or whole numbers to a starting number. For example, 1.72 + (11 x 0.07) = 2.49. Explore the patterns made on a counting grid and number line. Identify counting rules that match ...

### Hopper challenge: whole numbers

Help a frog to jump along a number line. Estimate the exact finishing point on a number line, after adding or subtracting multiples of whole numbers to a starting number. For example, 1+ (5 x 2) = 11. Explore the patterns made on a counting grid and number line. Identify counting rules that match the pattern of 'landing ...

### Hopper challenge: tenths

Help a frog to jump along a number line. Estimate the exact finishing point on a number line, after adding or subtracting multiples of tenths to a starting number. For example, 29.5+(12 x 0.2) = 31.9. Explore the patterns made on a counting grid and number line. Identify counting rules that match the pattern of 'landing ...

### Hopper challenge: ultimate

Help a frog to jump along a number line. Estimate the exact finishing point on a number line, after adding or subtracting multiples of tenths or whole numbers to a starting number. For example, 29.5+(12 x 0.2) = 31.9. Explore the patterns made on a counting grid and number line. Identify counting rules that match the pattern ...

### The slushy sludger: best guess

Use a vending machine to squirt 'slushies' into ice-cream cones. The machine serves coloured slush randomly from four slots. Work out which colour is the most common (most likely to be served). Notice that the least common colours are sometimes served. Make several guesses, then check your results from the random sample. ...

### Cassowary ecology quiz

Explore facts about the life of cassowaries: physical characteristics; diet; habitat; life cycles; and locations. Interact with graphs to see how much people can help cassowaries. Work through ecology notes and resources. Answer questions as you go; express your answers as fractions. This learning object is one in a series ...

### Compound shapes

Select from three levels of complexity for working with polygons. Estimate the area of a randomly-generated polygon. Try counting squares on a grid to help your estimate. Cut the shape into rectangles and triangles. Use a formula to calculate the exact area for each of the simple shapes. Then find the total area for the ...

### The foul food maker: go figure

This tutorial is suitable for use with a screen reader. It explains how the use of simple words can describe the likelihood of everyday events. How likely is an event: certain, likely, equal chance, unlikely or certainly not? Answer some questions using these words and then build your own examples. Learn how to describe ...

### Wishball: thousandths

Test your understanding of decimal place value with numbers that include thousandths. Receive a starting number, such as 3.569, and work towards turning it into a target number, such as 7.832. Spin a random digit, choose its decimal place value and decide whether to add or subtract the random digit from your starting number. ...

### Hopper: hundredths

Help a frog to jump along a number line. Estimate the finishing point on a number line, after adding or subtracting multiples of hundredths to a starting number. For example, 1.72 + (11 x 0.07) = 2.49. Explore the patterns made on a counting grid and number line. Identify counting rules that match the pattern of 'landing ...