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
No comments:
Post a comment