Decimals

Decimals

Adding, Subtracting and Multiplying

Review of adding/subtracting and multiplying

• What is the difference between adding/subtracting and multiplying?

Multiple Choice

Simon put this example on the board. What mistake was made?

• The decimals should be aligned.

• The numbers should be aligned on the right.

• There should be 1 decimal place in the answer.

• There should be 5 decimal places in the answer.

Multiple Choice

Theodore put this example on the board. What mistake was made?

• There should be 3 decimal places in the answer.

• There should be 5 decimal places in the answer.

• There should be 6 decimal places in the answer.

• The 5.1 should be on top, since it is a bigger number.

Multiple Choice

Megan bought 3 apples and 1 banana and spent $2.50. Apples cost $0.75 each. If there is no sales tax on fruit, how much did the banana cost?

• $0.75

• $2.25

• $0.88

• $0.25

Multiple Choice

Mr. Harris is purchasing 2.25 pounds of meat that costs $2.80 per pound. How much change should Mr. Harris receive if he gives the cashier $20.00?

• $6.30

• $13.70

• $14.95

• $2.52

Multiple Choice

What is seven hundredths times three and nine tenths?

• 0.0273

• 0.273

• 2.73

• 1.8

Multiple Choice

A library charges $0.10 a day in late fees for each book. Sidney returned 4 books that were 17 days late and 3 books that were 23 days late. How much did Sidney owe in late fees?

• $4.00

• $11.90

• 13.70

• $7.80

Multiple Choice

Mike bought 20 stamps for $0.45 each and 15 stamps for $0.32 each. How much money did Mike spend on stamps?

• $13.80

• $15.40

• $11.55

• $26.95

Multiple Choice

A parking lot charges $1.25 for the first hour and $0.75 for each additional hour. Matthew parked his car in the lot for 11 hours. He gave the cashier $10.00 for parking. How much change did Matthew receive?

• $1.25

• $0.31

• $0.50

• $8.00

Multiple Choice

Lisa had a budget of $100. She bought a shirt for $27.99 and a pair of pants for $25.99. How much money does she have left to buy other things?

• $46.12

• $45.02

• $46.02

• $53.98

Multiple Choice

Jason is making a banner to support a local sports team. He bought a paper that was 72.58 inches long. He cuts 3.213 inches from the length. How long is the banner after Jason cut it?

• 69.367

• 69.367 inches

• 69.357 inches

• 69.387 inches

Multiple Choice

Michael had $118.82 in his checking account. He had debits of $10.21 and $24.59. How much money does Michael have left in his checking account?

• 153.62

• 133.20

• $84.02

• 104.44

Multiple Choice

Electricity costs $2 for each of the first 16 kilowatt hours, and $0.075 per kilowatt hour thereafter. What would be the cost for 80 kilowatt hours of electricity?

• $36.80

• $12.00

• $80.00

• $54.60

Multiple Choice

Daniel bought 20 bags of sand. The first 5 bags cost $1.50 each. The rest of the bags cost $0.85 each. How much did Daniel pay for the 20 bags of sand?

• $19.75

• $17.00

• $30.00

• $20.25

What have we learned today...

• When adding and subtracting decimals, line the DECIMALS up.

• When multiplying decimals, line the DIGITS up.

Homework

• Check and work on any Missing work

• iReady

• Quiz on Friday! Adding, subtract and multiply decimals