DECIMALS ARE DELIGHTFUL!!!!

Adding and Subtracting Decimals What do you need to keep in mind? What do you need to keep in mind? Line up decimal points Line up decimal points

Contestant Pairs--You will be shown three items-- Record your price guess. Contestant Pairs--You will be shown three items-- Record your price guess. All Items were found on Walmart.com April 6, 2011.

Magellan RoadMate " Largescreen Portable GPS with Spoken Street Names

Basic Math and Pre-Algebra for Dummies (Paperback)

Better Homes and Gardens Autumn Lane 6-Piece Dining Set, Black and Oak

Record your guess.

Magellan RoadMate " Largescreen Portable GPS with Spoken Street Names The price: $148.54

The price: $18.90

The Price: $ Better Homes and Gardens Autumn Lane 6-Piece Dining Set, Black and Oak

AND THE TOTAL IS: $ $427.43

Subtraction Find the difference between your total and the actual total. Who came the closest without going over?

And our winning contestant pair is:

Multiplying Decimals -Do not line up decimal points -Start with the number with the most digits and place the other number underneath -Multiply, not attending to the decimal points 2.21 x.4 = 2.21 x.4 x

Multiplying Decimals 2.21 x.4 = 2.21 x.4 x Next, add the number of digits after the decimal in each factor-- Three -Start at the right in your answer and count to the left that many places. That’s where you put the decimal.884

Try a Few Yourself:.32 x.7.32 x x x x x

Get ready to play the Grocery Game You will be shown 4 items, you must determine the cost of each, and you must decide how many of each product you want to buy. All items must be purchased. Your total bill must be between $19.00 & $20.00 Let’s view the items and play the game:

Our winning contestant pair is:

Dividing Decimals Place the first number “inside the box,” the second number outside Place the first number “inside the box,” the second number outside 12.5 ÷ **The key to remember is we always need a whole number as the divisor—the number outside the box **The key to remember is we always need a whole number as the divisor—the number outside the box How do we change that number to a whole number? How do we change that number to a whole number?

Dividing Decimals How do we change that number to a whole number? How do we change that number to a whole number? We multiply by a power of 10— 10,100,1000, etc. We multiply by a power of 10— 10,100,1000, etc. The number of places we move the decimal in the divisor to make it whole is the same number we must move in the dividend The number of places we move the decimal in the divisor to make it whole is the same number we must move in the dividend

Dividing Decimals Our new problem is now Our new problem is now The decimal is placed in this new position in the quotient

Dividing Decimals ÷ ÷ ÷ ÷ ÷ ÷

Our next game is: Easy as Place the following items from the current in order from the lowest price to the highest price: Place the following items from the current Walmart ad in order from the lowest price to the highest price:

Crisco Vegetable Oil—48 oz

Windex Glass Cleaner-32 fl. oz.

33.8 oz. Aussie Shampoo or Conditioner

Sally Hensen Diamond Strength Nail Polish 0.45 oz

The correct order is: Windex $ 2.97 Crisco $ 3.34 Nail Polish $ 3.98 Aussie $ 5.97

Our winning contestant pair is:

How much is each product per ounce? Round to the ten- thousandths place. Windex 32 oz $ 2.97 Crisco 48 oz $ 3.34 Nail Polish.45 oz $ 3.98 Aussie 33.8 oz $

To place numbers in order: 1. Line up decimals 1. Line up decimals 2. Add zeros as needed 2. Add zeros as needed 3. Remove decimal 3. Remove decimal Let’s try this one together: 6.25, 6.205, 6.2, 6.21 First, line up decimals

To place numbers in order: Next, add zeros as needed: Finally, remove decimal and put in order from smallest to largest: th th nd nd st st rd rd

Your turn: Place in order from smallest to largest 8.09, 8.9, 8.909, 8.19

Let’s Practice Rounding Decimals: Divide and round to the nearest hundredth: ÷ ÷ 4 Divide and round to the nearest thousandth: 8.45 ÷ 0.69

Let’s Practice Order of Operations with Decimals: 3.57 – (0.4) x 2.5 ÷ – (0.4) 3 x 2.5 ÷ ÷ ( ) x (0.4) 2

Thank you for playing Decimals are Delightful!!!!

In-Class Problems: Pg. 166 Section , 14, 15, Pg. 166 Section , 14, 15, Pg. 167 Section Pg. 167 Section Section , 33 Section , 33 Section 2.5 – Section 2.5 – Pg. 168 Section 2.6 – Pg. 168 Section 2.6 – 51-56