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Listed under:  Positive integers

### 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 ...

### 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 ...

### The number partner

Explore how to break up numbers into pairs of smaller numbers such as 15 = 9 + 6. Work through examples of whole number pairs and sample questions. Apply these principles to solve additions or subtractions. Use a partitioning tool to break up numbers under 30. Recognise number patterns; use the strategy of counting on.

### The number partner: go figure

This tutorial is suitable for use with a screen reader. It explains strategies for breaking up numbers into pairs of smaller numbers, eg 15 = 11 + 4. Work through examples of whole number pairs and sample questions. Apply these principles to solve additions or subtractions.

### Number trains: 1–10 [Italian]

Use your knowledge of Italian numbers one to ten to arrange train carriages according to numbers on their sides. The numbers are represented in a range of formats such as Italian number words, numerals, dice dots or counting frames. Identify the numbers that come before and after starting numbers. This learning object is ...

### The array: go figure

This tutorial is suitable for use with a screen reader. It explains strategies for solving simple multiplications in your head such as 6x4. Work through sample questions and instructions explaining how to break up numbers into their factors. Solve multiplications by using arrays to break them up into rows and columns, then ...

### 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' ...

### The difference bar: make your own easy subtractions

Learn how to split up numbers in your head. Use a linear partitioning tool to help find the difference between pairs of numbers such as 8 and 64. Choose your own pairs of numbers (a single-digit number and a two-digit number). Split the numbers into parts that are easy to work with, work out each part and then solve the ...

### The difference bar: make your own hard subtractions

Learn how to split up numbers in your head. Use a linear partitioning tool to help find the difference between pairs of two-digit numbers such as 27 and 86. Choose your own pairs of numbers. Split the numbers into parts that are easy to work with, work out each part and then solve the original calculation. This learning ...

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.

### The difference bar: generate easy subtractions

Learn how to split up numbers in your head. Use a linear partitioning tool to help find the difference between pairs of two-digit numbers such as 25 and 34. In these examples, the difference is always less than ten. Split the numbers into parts that are easy to work with, work out each part and then solve the original calculation.

### The difference bar: generate hard subtractions

Learn how to split up numbers in your head. Use a linear partitioning tool to help find the difference between pairs of two-digit numbers such as 25 and 44. In most of these examples, the difference is greater than ten. Split the numbers into parts that are easy to work with, work out each part and then solve the original ...

### The difference bar: go figure

This tutorial is suitable for use with a screen reader. It explains how to split up numbers in your head when finding the difference between two numbers such as 26 and 73. Work through sample questions and instructions explaining how to use linear partitioning techniques. Find the difference between pairs of numbers. Split ...

### My family [English]

Meet a local family. Learn each person's age and family relationship. Identify relationships in a family tree. Meet other families and answer simple questions about family composition. Learn common numbers. Listen to spoken English.

### My family [Indonesian]

Meet an Indonesian family. Learn each person's age and family relationship. Identify relationships in a family tree. Meet other families and answer simple questions about family composition. Learn common numbers. Listen to spoken Indonesian and look at translations.

### My family [German]

Meet a German family. Learn each person's age and family relationship. Identify relationships in a family tree. Meet other families and answer simple questions about family composition. Learn common numbers. Listen to spoken German and look at translations.

### My family [Japanese]

Meet a Japanese family. Learn each person's age and family relationship. Identify relationships in a family tree. Meet other families and answer simple questions about family composition. Learn common numbers. Listen to spoken Japanese and look at translations in Hiragana, Romaji and English.

### Scale matters: tens of thousands

Explore the use of scale on a number line. Select a ruler displaying a helpful scale such as tens of thousands. Look at a pair of numbers such as 70,000 and 120,000 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. ...

### Scale matters: simple units

Explore the use of scale on a number line. Select a ruler displaying a helpful scale such as ones, tens or hundreds. Look at a pair of numbers such as 900 and 1200 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. ...

### Scale matters: ones

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 28 and 32 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 ...