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Numeracy Foundation June 2018 Unit 1 Q4

WJECFoundationCurrent spec4 marksSequences

4. A lighting company sells sets of lights in different sizes.
Some of the sets are shown below.

Set 1: 3 light bulbs; Set 2: 5 light bulbs; Set 3: 7 light bulbs. Each set is a string of bulbs joined in loops, each new loop adding 2 bulbs and sharing 1 bulb with the previous loop

The pattern can be continued to make larger sets of lights.

(a) How many light bulbs are needed to make Set 5?
Circle your answer. [1]

9     10     11     12     13

(b) Which set has 27 light bulbs? [2]

Set ……………

(c) A customer thinks that to find the number of bulbs that are in a set, you multiply the set number by 3.
Is the customer correct?

Yes ☐    No ☐

Give a reason for your answer. [1]

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