recognize a proportionality table
Does the following table correspond to a proportionality table?
| 2 | 9 | 10 | 4 |
|---|---|---|---|
| 4 | 18 | 20 | 8 |
Prime numbers
A prime number is an integer greater than or equal to 2 that has no divisors other than 1 and itself.
Decomposition in product of primes
Any integer greater than or equal to 2 is prime or product of primes.
When we write an integer as a product of prime numbers, we say that we
decompose this integer into a product of prime numbers.
Percentage
A percentage is defined as a proportionality coefficient expressed as a fraction with a denominator of 100.
To calculate p% of a number is to multiply that number by `p/100`.
Euclidean division
Performing Euclidean division of a by b, is equivalent to determining two numbers, the quotient (q) and the remainder (r) such that a = b*q + r .