6NS.3 Jadyn’s Snacks Jaydn has $ She buys an apple for 79 cents and a granola bar for $1.76. A.How much money did Jadyn spend? B.How much money does Jadyn have now?

3.3 Adding and Subtracting Decimals EQ : How do you solve problems involving the addition, subtraction, multiplication, and division of decimals? (SPI: ) /CC.6EE.2b

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DateDescription of Transaction Payment Debit (-) Deposit Credit (+) Balance Jun 24Opening Deposit Jul 4Buy Beach Towel Aug 3School Supplies Aug 30Homecoming Dance Sep 12Progress Report Money

Place value can help you understand and write and compare decimal numbers. Review: Decimal Place Value

ADDING OR SUBTRACTING DECIMALS What do you do when you are adding or subtracting decimals?  Line’em Up  Drop’em Down

3.3 ADDING AND SUBTRACTING DECIMALS I can add and subtract decimals and use estimation to check my answers

ADDING OR SUBTRACTING  Line up decimals.  Add zeros as place holders.  Add. Bring the decimal down from the problem = ?

SUBTRACTING EXAMPLE: 5 – 0.64 = ?  Line up decimals.  Add the decimal point to the whole number 5.  Add zeros as place holders.  Subtract. Bring the decimal down from the problem

THINK ABOUT IT….  Why is it important to line up your decimals?  Why do we add zeros?

Add Align the decimal points.Use zeros as placeholders.Add. Then place the decimal point. Check the reasonableness of this answer using rounding. Does your answer make sense?

EXAMPLES: 1.12 – = ? = ? = ? 4.88

Essential Question  How do you solve problems involving the addition, subtraction, multiplication, and division of decimals?

Lesson Quiz Find each sum or difference – Evaluate – x for x = During an ice-skating competition, Dawn received the following scores: 4.8, 5.2, 5.4. What was Dawn’s total score?

ESTIMATION  Why is estimation a good way to check your answers?  How else could you check your answers?

PROBLEM SOLVING  Samantha is balancing her checkbook. The balance from her last statement was $ Since than she made 1 deposit of $42.05 and wrote 1 check for $ How much money does Samantha have left in her account?

 You go to Falcon Flight and buy popcorn for $1.35, a soda for $1.20 and a slice of pizza for $2.33. You pay with a $5.00 bill. Write an equation to show how much change you will receive and solve it.  Let c = the change you get back  $5.00 – ( ) = C  c = 5.00  C=$0.12

EXAMPLES: = ? = ? = ? 56.61

EXAMPLES: – = ? – 3.56 = ? 4.44

Adding and Subtracting Decimals Showdown!!!