Factors, interest, rate Flashcards
A factor
A number that divides into your original number with no remainder
Prime number
A number that has only two factors and they are 1 and itself. 1 is not a prime number
Prime factorisation
Writing a number as the product of all its prime factors
HCF?
The HCF of two OR MORE numbers is the biggest number that can divide into all of the original numbers with no remainder
How to find HCF
Identify all of the prime factors which your original numbers have in common.
LCM?
The LCM of two or more numbers is the smallest number which can be divided by the original numbers.
The original numbers are factors of the LCM
How to find LCM
Include the smallest number of factors such that both original numbers have all their factors in the LCM.
Ratio
Compares two quantities of the same unit
You must do the same thing on both sides
Rate
The comparison of quantities of different units
Direct proportion
Two quantities increase / decrease in the same ratio
Indirect proportion
When one quantity increases but the other decreases in the same ratio
Interest
Is calculated as a percentage of the amount borrowed (principal amount)
SI formula
A = P( 1 + i x n )
Parts of the interest formula
A - Amount (end)
P - Principal (original)
I - Interest (fraction)
L - Long (Years)
Hire Purchase
You pay deposit (% of value upfront)
What you haven’t paid yet grows by simple interest
Pay it off in equal monthly installments
