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GCSE Maths Number Revision
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Terms in this set (35)
Whole number
What is an integer
Only has 2 factors, 1 and itself. 2,3,5,7,11,13,17,19,23,etc
What is a
prime
number ?
6, 12, 18, 24, 30....
What are the multiples of 6
2x2x3 = 2² x 3
What are the
prime factors
of 12 ?
Use a factor tree
2 isn't but 3 and 5 are
(digit sum 5+2+3+5 > 15 > 6)
Are 2,3 and 5 all factors of
5235
?
12
What is the
lowest common multiple
of 4 and 6 ?
25
What is the
highest common factor
of 50 and 75 ?
0.04
What is 0.2 x 0.2 ?
Use a chinese multiplication for decimals
3.1
What is 3.14159265359 to 1 decimal place?
3800
What is
3782
to 2 significant figures?
28
Estimate 4.3 x 6.85
Round to easier numbers
2/3
What is 16/24 in its simplest terms?
Equivalent fractions
1/2, 2/4 and 3/6 are what?
1
Work out
2/7 + 5/7
same denominator so can add top
5/6
Work out
1/3+ 1/2
make the same denominator
6/15
Work out
2/3 x 3/5
Multiply across top and across bottom
KFC
½ x 4/3 = 4/6 = 2/3
How would you work out
½ ÷ ¾
2 ¾
Express 11/4 in mixed numbers
3/4
Which is the biggest 3/5, 5/7, or 3/4 ?
15/100 = 3/20
Express 15% as a fraction in its lowest terms
8
What is 10% of 80 ?
£48
What is £40 + 20% VAT ?
60%
What is 0.6 as a percentage ?
1/50
What is 0.02 as a fraction in its lowest terms?
£8 and £12
Split £20 in the ratio 2:3
60%
What is 24/40 as a percentage ?
1+ 2 x (3 + 4) = 15
Put in a pair of brackets to make this correct:
1+ 2 x 3 + 4 = 15
4n + 1
What is the rule for this sequence?
5 9 13 17 ....
True 8 x 8 = 64
4 x 4 x 4 = 64
"64 is a square number
and
a cube number"
True or false?
298
What is the 100th term in this sequence?
1 4 7 10 13 ...
No - 36 [+1] 37 . 5n = 37, 37 isn't in the 5 times table so no
Is 36 in the sequence with the rule 5n - 1 ?
¼
Work out (½)²
2
Work out -5 - - 7
1, 4, 9, 16, 25
What are the first 5 square numbers?
1, 8, 27, 64, 125
What are the first 5 cube numbers?
;