This task is about patterns and rules.
Fill in the spaces below to show the next 2 triangular numbers in the sequence. Draw a diagram for these numbers.
3 is a triangular number: 
6 is the next triangular number: 
| a) |
__________ is the next triangular number. Diagram:
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| b) |
__________ is the next triangular number. Diagram:
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| c) |
Complete this sentence: "Each row is n + _____ of the row before it."
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| d) |
In a supermarket Jane builds up a display of tins of soup like this:
If there were a total of 28 tins, how many tins high would the stack be?
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(A) 6
(B) 7
(C) 14
(D) 28
(E) 56
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