Multiply and Divide Integers, Fractions, and Decimals

When MULTIPLYING DECIMALS count the decimal places in each factor and ...

• Move that total amount of decimal places in your answer.

• Subtract.

• Find the square root.

• BE HAPPY!

When DIVIDING FRACTIONS ...

• Add the fractions.

• Get a common denominator.

• Keep the 1st fraction, Change to multiplication, and Flip the 2nd fraction to its reciprocal.

• Subtract the fractions.

When MULTIPLYING FRACTIONS...

• You MUST get a common denominator.

• Multiply across the top, multiply across the bottom.

• Add the fractions.

• Subtract the fractions.

• -4
• 4
• 16
• -16

• 7
• -7
• 63
• 63

Multiply
(5) • (–9) • (–2)

• 90

• -45

• -90

• 47

Q1. What is the result of 21 - 42?

• 21

• -21

• 17

• -17

• -4
• 4
• 3
• -3

• 12
• -12
• -11
• 11

When MULTIPLYING AND DIVIDING a (Negative)(Negative) =

• a POSITIVE answer.

• a NEGATIVE answer.

• a square root.

• a mess.