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Multiplting Numbers

Positive x Positive = Positive
Positive x Negative = Negative
Negative x Positive = Negative
Negative x Negative = Positive

Examples of Multiplying Decimals

2.3 x 4.1=9.43
5.5 x 3.3=18.15
12 x 3.1= 37.2
15x1.5=22.5

Prime Numbers

A Prime Number is a number that can only be divided by itself and 1.

Recurring and Terminating Decimals

A recurring decimal is a decimal that goes on forever. (3.333333333333 recurring is a recurring decimal because it has no end)

A terminating decimal is a decimal has an ending. (So 1.2 is a terminating decimal because it stops)

LCM

LCM stands for lowest common multiple.
This is the lowest multiple that two numbers share.
eg. the LCM of 2 and 5 is 10.

Examples of Prime Numbers

2,3,5,7,11,13,17,19,23,29,31,37,41

Multiplying Decimals

Multiply the numbers as if they aren't decimals. (3.4 x 5.3 would be 34 x 53) Then count how many numbers there are behind the decimal point. ( In this case, there are two decimal points.) Then place the decimal point the number of places behind the two numbers. ( So the answer would be 18.02)

Fractions

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Multiplying Fractions

There are 3 simple steps to multiplying fractions:

1. Multiply the top numbers (the numerators).

2. Multiply the bottom numbers (the denominators).

3. Simplify the fraction if needed.

 

Example:

2/3 X 2/5 =4/15

Dividing Fractions

Turn the second fraction upside down, then multiply.

There are 3 Simple Steps to Divide Fractions:

Step 1. Turn the second fraction (the one you want to divide by) upside-down
Step 2. Multiply the first fraction by that reciprocal

Step 3. Simplify the fraction (if needed)