Number Flashcards
Integer
Whole number
Rational number
Can be written as fractions, come in 3 different forms: 1. Integers e.g. 4(=4/1), -5(=-5/1), -12(=-12/1) 2. Fractions e.g. 1/4 3. Terminating or recurring decimals e.g. 0.33333… 1/3
B.I.D.M.A.S
Brackets Indices Division Multiplication Addition Subtraction
Prime numbers
2, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43
How do you do a factor tree?
What does LCM mean, and how do you use it?
‘Least Common Multiple’
e.g. 18 = 2 x 3²x and 30 = 2 x 3 x 5
find the LCM of 18 and 30
18 = 2 x 3²x and 30 = 2 x 3 x 5
find the LCM of 18 and 30
18 = 2 x 3 x 3 and 30 = 2 x 3 x 5
so the prime factors that appear in either number are 2, 3 , 3, 5 (list 3 twice as it appears in 18)
LCM = 2 x 3 x 3 x 5 = 90
What does HCF mean?
‘Highest common Factor’
180= 2² x 3² x 5 and 84 = 2² x 3 x 7
Use this to find the HCF of 180 and 84
180 = 2 x 2 x 3 x 3 x 5 and 84 = 2 x 2 x 3 x 7
2, 2 and 3 are prime factors of both numbers, so HCF = 2 x 2 x 2 = 12
Cancelling down fractions
Mixed number
Multiplying fractions
Dividing Fractions
Common Denominators
Adding and Subtracting
How do you go from a fraction, to decimal to a percentage… And the other way round?
How do yo change a recurring decimal into a fraction?
How to estimate?
How to estimate square roots?
upper and lower bounds …
Maximum and Minimum values of bounds…
What is the rule and what are the 3 rules?
A x 10^n
- A must be between 1 and 10
- The power of 10, n, is the number of places the decimal point moves
- n is positive for big numbers, n is negative for small numbers
Irrational Numbers
Numbers that can’t be expressed as a fraction
