Page 29 - 新思维数学学生用书6 样章
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2 Numbers and sequences
2.3 Common multiples and factors
We are going to …
• find common multiples
• find common factors.
Imagine you have this bar of chocolate. You divide it between you and your friends so
you all have the same number of pieces.
common factor
common multiple
factor multiple
You can divide it equally between 2 people, 3 people, 4 people, 6 people, 8 people,
12 people or 24 people.
We say that 24 is a common multiple of 2, 3, 4, 6, 8, 12 and 24.
In this section you will learn about common multiples and common factors.
Worked example 3
Anna is thinking of a number.
She says, ‘My number is a multiple of 3 and 5 and is less than 20.’
What number is Anna thinking of?
Multiples of 3 are: The answer must be less than 20.
3, 6, 9, 12, 15, 18
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