Memory Lane

Memorize Everything on this Page!

First and Most Important memorize your multiplication tables!!

Fraction-decimal-percent

Squares and square roots

                                                      Circles               Π=3.1415

Properties

Mean, Median, Mode and Range

Mean-The sum of all the items divided by the number of items in the set. Sometimes the mean is called the average.

Median-the middle value when the data are in numerical order. Or the mean of the two middle values if there are an even number of items.

Mode-The value, or values, that occur the most often. There may be more than one mode. When all values occur an equal amount of time, there is no mode.

Range-The difference between the least and greatest values in the set.

 

Signed Numbers

Adding Signed Numbers:

1. Signs are the same: (both positive or both negative)-Add the absolute values and keep the sign of the numbers.

2. Signs are different: (positive and negative)-Subtract the absolute values and keep the sign of the larger number.

Subtracting signed numbers:

1. Stay, change, change. Change the operation to addition and change the sign of the second  number (number on the right).

2. Follow the two rules for addition.

Multiplying and dividing signed numbers:

1. If the signs are the same, the answer is positive.

2. If the signs are different, the answer is negative.