4MA0 Foundation June 2012 Paper 1 Q6

EdexcelFoundationOld spec4 marksSequences

6 Here are the first five terms of a number sequence.

36 33 30 27 24

(a) Find the next two terms of the sequence. (2)

(b) Explain how you found your terms. (1)

Scheme	Marks
21 18	B2
	(2)

Mark scheme (b)

Scheme	Marks
eg take away 3	B1
	(1)

Notes

B1: See Additional Guidance

Additional Guidance

3 may be explicitly stated
eg Accept
Subtract 3
Take away 3
−3
goes down in threes
3 less
\(n - 3\)
\(39 - 3n\)
but do not accept just ‘3’

3 may be implied
eg Accept
Count from 36 to 33 [‘down’ implied]
I counted the difference between 36 and 33
I found the difference
[Condone imprecise use of ‘difference’.]

the fact that the terms are multiples of 3 may be stated or implied
eg Accept
Multiples of 3
3 times table

as 39, 42 are now acceptable answers to part (a), we must extend the range of answers to part (b)
eg Accept
I counted up in 3s
Add 3
goes up in 3s

Do not accept a non-specific description
eg I looked at the numbers and found a pattern.