GCSE Maths Foundation Revision

The nth term of an arithmetic sequence can be found using the formula: a_n = a + (n-1)d, where 'a' is the first term and 'd' is the common difference.

The common difference is the difference between consecutive terms in an arithmetic sequence. For example, in the sequence 5, 13, 21, 29, the common difference is 8.

To solve for n, subtract 3 from both sides to get 2n = 20, then divide by 2 to find n = 10.

A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.

A composite number is a natural number greater than 1 that is not prime, meaning it has more than two positive divisors.

A factor is a number that divides another number without leaving a remainder.

A multiple of a number is the product of that number and an integer.

To convert a decimal to a fraction, write the decimal as a fraction with a denominator of 1, then multiply the numerator and denominator by 10 for each digit after the decimal point.

The simplest form of 30/100 is 3/10.

To isolate a variable, perform inverse operations to both sides of the equation until the variable is alone on one side.