To calculate the mode of a set of numbers you need to start by organizing them from the smallest to largest. So for instance, you list may be 1, 3, 6, 6, 8, 9. You will then need to go about counting the amount of times that numbers appear in the sequence. The number that appears the most in the sequence is the mode. In this sequence it's really easy, as the only number that appears more than once in the sequence is six. Other more complicated sequences, however, might take you a while to organize and you may ultimately find that there is more than one mode in the sequence.

To obtain the median, you will once again need to sort the numbers in your sequence from the least to the largest. For instance, you may have the same number set of 1, 3, 6, 6, 8, 9 again. You will then need to find the middle number. So for instance in the sequence, if there are seven numbers you will need to find the fourth number and that would be the median. In our example, however, there are two numbers in the middle. Luckily they are the same, so the median is just six. In more complicated sequences, however, you will need to find the average of the two middle numbers to get the median. So you would have to add them together and divide them by two to get he median figure.

Finally, the range, Sort the numbers from the least to the largest and then determine the value that is the smallest and the value that is the biggest. Subtract the smaller number away from the largest number and you will be given the value that is the range in the sequence you are using.

To obtain the median, you will once again need to sort the numbers in your sequence from the least to the largest. For instance, you may have the same number set of 1, 3, 6, 6, 8, 9 again. You will then need to find the middle number. So for instance in the sequence, if there are seven numbers you will need to find the fourth number and that would be the median. In our example, however, there are two numbers in the middle. Luckily they are the same, so the median is just six. In more complicated sequences, however, you will need to find the average of the two middle numbers to get the median. So you would have to add them together and divide them by two to get he median figure.

Finally, the range, Sort the numbers from the least to the largest and then determine the value that is the smallest and the value that is the biggest. Subtract the smaller number away from the largest number and you will be given the value that is the range in the sequence you are using.