Page 31 - 新思维数学学生用书6 样章
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2 Numbers and sequences
2 The numbers in this sequence increase by 3 each time.
3, 6, 9, 12, …
The numbers in this sequence increase by 5 each time.
5, 10, 15, 20, …
Both sequences continue.
Write a number bigger than 100 which is in both sequences.
3 Write all the common multiples of 3 and 8 that are less than 50.
4 Olivia and Amir play football regularly.
Olivia plays once every 4 days.
Amir plays once every 3 days.
If they both play football today, how many times in the next fortnight will they
play on the same day?
Are you using common multiples or common factors in your answer? Explain
the difference.
5 a Write the factors of 18.
b Write the factors of 24.
c Draw a ring around the common factors.
6 Write all the factors of 30 that are also factors of 20.
7 Pierre gives 32 football cards to his friends.
He shares them equally so all his friends have the same amount.
How many friends could Pierre have? Explain your answer.
Think about your answer. Are there any other possible answers?
How do you know? Did you think about checking your answer with
your partner?
30
