Math Worksheets

Archive for March, 2009

Math Worksheets

Definition of averages

The definition of an average can be defined by way which an average is calculated. The most common way to find an average is to add up a list of numbers and divide the sum by the number of items on the list.

Are Mean and average the same?

No. Mean and average are not the same and should not be used interchangeably. It is true that in simple math problems, the Mean is the same as the average. In another word, the average is the same as simple Mean or arithmetical Mean. The average is not the same as the other type of Mean called geometric Mean.

Example of how to find an average

Find the average number of the list of numbers below:

3, 4, 6, 8, 9

To find the average:

Step 1: Add the numbers up

3 + 4 + 6 + 8 + 9 = 30

Step 2: Divide the sum by the number of items.

There are 5 numbers above. So, 30 ÷ 5 = 6.

Answer of the math question: the average of 3, 4, 6, 8, and 9 is 6.

It doe not matter what the unit is the math calculation method for finding an average remains the same. Use the same method to find an average in length (meters, centimeters, yard, etc.), weight, volumn, temperature, and so on.

Click here for simple Math Worksheets of finding averages.

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Question: Kumon level G….? HELP PLEASE READ IF UR GOOD AT MATHS!!!!!!!!?

I’m on level G of kumon right now and I’m already like halfway through all the worksheets but i still dont undertsnad adding and subtracting positive and negative numbers! its so fustrating cos i know how to times and divide pos and neg numbers but dont know how to add and sub!!!!!!!! please give me some tips or the rules of add and subtracting pos and neg numbers and i have my g test soon and im freaking out!!!!!!!!!!!!!!!!!

Answer: This is very easy. Just look at examples.

1+1 = 2
2+1 = 3
2–1 = 1
1–2 = –1

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Adding Integers – YourTeacher.com – Math Help

The mean is sometimes referred to as The Average. The mean is also sometimes called sample mean or arithmatic mean. Sometimes, Mean Median Mode is replaced by Mean Median Average. However, the meaning of Mean Median Mode is different from Mean Median Average. Lets examine the definition of mean, Median, mode, and average below.

Simple mean or arithmatic mean

The simple mean or arithmatic mean is simply The Average of all the items in a sample. To compute a sample mean or arithmatic mean, add up all the sample values and divide by the size of the sample. This is the same method as finding an average. So, simple mean and arithmatic mean are the same as The Average.

Geometric mean

The geometric mean is a measure of central tendency, just like a Median. Geometric mean is different from the simple mean or arithmatic mean. Geometric mean is also more complicated to calculate. Instead of adding values, Multiplication rather than Addition is used to summarize data values to calculate geometric mean.

Definition of geometric mean

The geometric mean is defined as the nth root of the product of all the numbers of the set where n is the number of numbers in the set.

Example of geometric mean

What is the geometric mean of 2, 4, and 8?

First we multiply the three numbers 2 x 4 x 8 = 64.

Second, we need to find the cube (3rd root) root of 64. In this case the root is 4. So the geometric mean is 4. The cube root of a number is not easy to calculate. Unless you have a mathematical calculator or a computer or the answer is easy to spot, it will be difficult to calculate the geometric mean of a series of numbers.

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