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Commonly occurring values shown in Percent, Decimal and Fraction to learn.

A fraction to a decimal: Divide the denominator (the bottom part) into the numerator (the top part).

1/4 = 1 ÷ 4.00 = 0.25

A fraction to a percent: Multiply the fraction by 100 and reduce it. Then, attach a percent sign. 1/6 x 100/1 = 100/6 = 50/3 = 16.66/1% = 16.66%

A decimal to a fraction: Starting from the decimal point, count the decimal places. If there is one decimal place, put the number over 10 and reduce. If there are two places, put the number over 100 and reduce. If there are three places, put it over 1000 and reduce, and so on. 0.30 = 30/100 = 3/10

A decimal to a percent: Move the decimal point two places to the right. Then, attach a percent sign. 0.45 = 45%

A percent to a decimal: Move the decimal point two places to the left. Then, drop the percent sign. 85% = 0.85

As I have learnt there are two types of nth term, Constant Difference Sequences and Changing Difference Sequences.

Constant Difference Sequences as the name suggests, is when the difference between terms is always the same. For example, 1, 4, 7, 10, ... has a difference which is always 3.

So how do you find the formula for the 'nth' term? Well, the three times table has the formula '3n'. 3, 6, 9, 12, 15, ... 1, 4, 7, 10, ... and the terms in this sequence are two less than the terms in the three times table so the formula is '3n - 2'.

Changing Difference Sequences are much more difficult and I will edit this post once I feel confident I understand the formula.

I have spent so long on this and I still can't get my head around this formula;

nth term = a + (n - 1)d + ½(n - 1)(n - 2)c

For any circle where the radius is given the area, A, is found using the formula A=πr2

Pi = π = 3.14 Square = 2 = a number multiplied by itself.

In plain terms this is read as, Area = 3.14 multiplied by whatever the radius is then multiplied by the radius again.