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Listed under:  Number operations

### BBC Bitesize: decimals

This interactive resource presents a review of some decimal fraction concepts and calculations. The resource includes a review of place value, addition and subtraction of decimals, and multiplication of decimals by whole numbers and powers of 10. Practice questions, with answers, are provided for students and students have ...

### 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 ...

### 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.

### 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 ...

### TIMES Module 3: Number and Algebra: multiplication and division - teacher guide

This is a 23-page guide for teachers. This module contains a description of suitable models for multiplication, a discussion of the type of problem phrased in words that requires multiplication for its solution, and mental and written strategies for multiplication. The use of the commutative, associative and distributive ...

### Whole numbers with all four operations

This is a website designed for both teachers and students that addresses whole numbers with the four operations from the Australian Curriculum for year 6 students. It contains material on the strategies and algorithms used when adding, subtracting, multiplying and dividing whole numbers. There are pages for both teachers ...

### When do all answers equal one?

Did you know that any number (except zero) raised to the power of zero equals one? See examples of this index law (the third index law) for the power zero in action.

### The power of exponential notation

Do you know what 2 raised to the power of 3 equals? See how to write numbers raised to a power. Watch how an exponential number can be written in expanded form, so that you can see the number as a product of its factors. See how to apply the first index law.

### The multiplier: generate easy multiplications

Solve multiplications such as 9x88. Use a partitioning tool to help solve randomly generated multiplications. Learn strategies to do complex arithmetic in your head. Split a multiplication into parts that are easy to work with, use simple times tables, then solve the original calculation. This learning object is one in ...

### The multiplier: go figure

This tutorial is suitable for use with a screen reader. It explains strategies for solving complex multiplications in your head such as 22x38. Work through sample questions and instructions explaining how to use partitioning techniques. Solve multiplications by breaking them up into parts that are easy to work with, use ...

### TIMES Module 10: Number and Algebra: division of whole numbers - teacher guide

This is a 26-page guide for teachers. This module contains a description of suitable models for division, a discussion of the types of problems that require division for their solution, and mental and written strategies for division.

### Starting Smart: how are problems solved? - years 4-6

This curriculum resource package is a ten-week teaching plan and set of supporting resources for the middle to upper primary years, focusing on developing students' problem-solving skills. Beginning with students' understanding and knowledge of number, students learn strategies to use number sentences to solve problems ...

### 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 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 ...

### BBC Bitesize: multiplication and division - revision

This is a set of information sheets dealing with whole-number calculations involving short multiplication and division. Students have access to test questions to assess their learning. This resource is one of a series of online resources from the BBC's Bitesize collection.

### The beauty of prime numbers

A prime number is a number that only has two factors: one and itself. Listen to Adam Spencer and Richard Glover discussing prime numbers. They cover how we define these numbers and how and why prime numbers are widely used in internet encryption.

### 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.

### 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'.

### 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'.