Prime Number, Square Number, Sequence
Here
are 5 rows of numbers.
Row
A
|
2
|
4
|
6
|
8
|
10
|
12
|
14
|
16
|
Row
B
|
3
|
5
|
7
|
9
|
11
|
13
|
15
|
17
|
Row
D
|
1
|
2
|
5
|
10
|
20
|
50
|
100
|
200
|
All
the numbers are even in one of the rows.
(a) Which
row?
……………
(1)
(b) The
numbers in Row C are the first 7 prime numbers written in order of sizes.
Write
the next prime number.
……………
(1)
(c) Write
down a square number from Row D.
……………
(1)
The
numbers in Row E are the first 7 numbers of a sequence.
(d) Work
out the next number in the sequence.
……………
(1)
(Total
4 marks)
Answers
(a) Row A
(b) 19
(c) 100 (can also be 1)
(d) 128 ( each number doubles, nth term = 2n)
-------------
Students note:
- knowing your square numbers (say the first 10) will help with finding answers to square roots, e.g. square root of 100 is 10
- there are two ways of finding nth term in a sequence: finding the right pattern and or working our the rule.
Teachers note:
It can be helpful to use the same test format when setting test
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