Year 5 - Maths
Explain what a factor is and use arrays and multiplication and division facts to find them
Understand and use the concept of factorisation (square and prime numbers)
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
In this unit pupils will understand and use the concept of factorisation, explaining what a factor is and how to use arrays and multiplication/division facts to find them. They will identify prime numbers, square numbers and composite numbers.
Lesson Summary
You will learn to explain what a factor is and find factors using arrays and known multiplication and division facts.
Key Notes
- A factor is a whole number which can be multiplied by another whole number to equal a given number or product.
Vocabulary To Learn
- Row: Objects lying side by side in a horizontal line is known as a row.
- Column: A column is an arrangement of objects one above the other in a vertical line.
- Array: An array is when items are arranged in rows and/or columns.
- Factor: Factors are whole numbers which exactly divide another whole number.
- Product: The product is the result of two numbers (factors) multiplied together.
Common Mistakes To Avoid
- Pupils try to represent numbers as an array with an unequal amount in rows and columns.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
A factor is a whole number which can be multiplied by another whole number to equal a given number or product. A factor is a whole number which can be multiplied by another whole number to equal a given number or product.
2. Use this key word in a maths sentence and explain it clearly. 'Row'
Objects lying side by side in a horizontal line is known as a row. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Pupils try to represent numbers as an array with an unequal amount in rows and columns. Correction: Ensure pupils are given time to explore representing numbers as arrays and identifying where the numbers in a multiplication equation come from within their array.
More Lessons In This Unit
Browse all guides in the Year 5 Maths guide library.