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Listed under:  Mathematics  >  Number (Mathematics)  >  Directed numbers
Interactive resource

Integer cruncher: subtraction

Use counters to model the subtraction of integers, for example (-3)-(-5)=(+2). See the calculations represented in an alternate form on a number line. This learning object is one in a series of four objects.

Interactive resource

Integer cruncher: addition

Use counters to model the addition of integers, for example (-2)+(+5)=(+3). See the calculations represented in an alternate form on a number line. This learning object is one in a series of four objects.

Interactive resource

Scale matters: range of numbers

Explore the use of scale on a number line. Select a ruler displaying a scale such as ones, tenths or hundredths. Look at a pair of numbers marked on a number line. Identify the number corresponding to another point. Or locate another point on the number line to complete a series of three numbers. Apply a marked scale to ...

Interactive resource

Scale matters: negatives

Explore the use of scale on a number line. Select a ruler displaying a helpful scale such as ones. Look at a pair of numbers such as -5 and -2 marked on a number line. Identify the number corresponding to another point. Or locate another point on the number line to complete a series of three numbers. Apply a marked scale ...

Interactive resource

Integer cruncher: addition and subtraction

Use counters to model the addition and subtraction of integers. For example, (-2)+(+5)=(+3) or (-2)–(-5)=(+3). See the calculations represented in an alternate form on a number line. This learning object is one in a series of four objects.

Interactive resource

Exploring integers

Calculate the change in temperature between two days. Notice that the temperature difference may be positive or negative. For example, if the temperature is 17 °C one day and 14 °C the next day, then the temperature change is -3 °C. Watch a video showing how temperature is expressed using integers. Find out why temperature ...

Interactive resource

Exploring exponents and scientific notation

Examine a group of eight numbers expressed using scientific notation. Sort them into positive and negative numbers. Group them according to whether they are greater or less than -1, 0 and 1. Arrange the numbers within each group in ascending order.

Interactive resource

Exploring number patterns

Find an addition or subtraction pattern relating to four numbers on a grid. Predict the next three numbers in the pattern. For example, predict the next three numbers in the following sequence: 60, 53, 46, 39...

Assessment resource

Scale matters: all numbers: assessment

Test your understanding of the use of scales, ranging from tens of thousands or thousands through to ones, tenths or hundredths. Look at two numbers and place a third number on a number line. Rename the third number by assigning place values for each digit or group of digits. For example, look at the numbers 105 384 and ...