Factors, multiples and the HCF

Multiples, factors and HCF, and divisibility rules. Read one part at a time and tap “I know this”. Then test yourself in the quiz.

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Multiples and factors

Term	Meaning	Example
multiple	the answers in a times table	multiples of 4: 4, 8, 12, 16 …
factor	numbers that divide exactly into a number	factors of 12: 1, 2, 3, 4, 6, 12

Meerkat tip

Find factors in pairs: 12 = 1 × 12 = 2 × 6 = 3 × 4.

Tap when you could tell someone without looking.

HCF (highest common factor): the biggest factor two numbers share. HCF of 12 and 18 = 6.

Rule

Factors of 12: 1, 2, 3, 4, 6, 12. Factors of 18: 1, 2, 3, 6, 9, 18. Common factors: 1, 2, 3, 6, so HCF = 6.

Tap when you could tell someone without looking.

Tap when you could tell someone without looking.

Remember this: your summary

Write these points in your book. Read them again the night before the test.

Memory trick

Factors fit INTO a number; multiples grow OUT of a number.

Flash cards · Tap to turn over

First say the answer yourself, then turn the card over.

Test yourself · Part 2

Read the question and the answer. Is the answer right? Tap True or False.

Now the real quiz!

The quiz has many more questions on this topic. Every question shows straight away whether you are right and explains why.

For parents

Let your child work the examples on paper and explain them to you.
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Follows CAPS for Grade 5 Mathematics. Always check your teacher’s notes and textbook too.