Operations with Decimals

On Tuesday, Mr. Rodriguez bought a new video game system for $345.67. On Friday, the system went on sale for $299.99. How much money could Mr. Rodriguez have saved if he would have bought the system on Friday?

• $44.98
• $154.23
• $645.66
• $45.68

Tags

CCSS.3.NBT.A.2

You buy $4.73 worth of food. You pay with a $5 bill. How much change should you receive? 

• $27

• $0.27

• $9.73

• $4.78

Answer explanation

Be sure to line up your decimals and add zeros if needed.

The decimal on 5 is at the end, so it is 5.

Tags

CCSS.3.NBT.A.2

If I make $10.50 an hour and work 4 hours how much do I make?

• $42.24

• $42.04

• $40.24

• $42.00

Tags

CCSS.3.OA.A.1

CCSS.3.OA.A.3

CCSS.3.OA.B.5

CCSS.3.OA.C.7

Justin made $46 mowing lawns during the summer. He went to the movies and spent $16.54, the arcade and spent $8.50, and the comic book store and spent $12.98. How much money does he have left?

• $7.98
• $5.48
• $6.92
• $8.21

Answer explanation

First, find out how much he spent in total.

Then, subtract that from his "starting" money.

Tags

CCSS.3.NBT.A.2

CCSS.3.OA.D.8

Sarah bought 2.5 meters of fabric to make a patchwork quilt. If the fabric was on sale for $6.20 per meter, how much did Sarah spend?

• $15.50
• $155
• $15.65
• $1.55

Tags

CCSS.3.OA.A.3

CCSS.3.OA.C.7

CCSS.3.OA.D.8

Leena bought 22 boxes of crayons for $28.16. How much did she pay for each box of crayons?

• $1.28
• $6.16
• $12.80
• $0.13

Answer explanation

EACH also means, how much is it for one box. To find this you must divide.

$28.16 divided by 22

Tags

CCSS.3.OA.A.2

CCSS.3.OA.A.3

CCSS.3.OA.D.8

Yesterday I went to 7-11 and purchased 4 candy bars that were $1.25 each and 6 packs of gum that were $2.75 each. How much did I have to pay the cashier, before tax?

• $7.50

• $21.50

• $5.00

• $16.50

Answer explanation

1) Find the cost of the candy bars. (x)

2) Find the cost of the gum. (x)

3) Add the two costs.

Tags

CCSS.3.NBT.A.2

CCSS.3.OA.A.1

CCSS.3.OA.A.3

CCSS.3.OA.C.7

CCSS.3.OA.D.8

Josh bought one T-shirt for $7.90 and another T-shirt for $12.40. What is the total amount he spent?

• $4.00
• $4.50
• $20.30
• $20.00

Tags

CCSS.3.NBT.A.2

• 29.5

• 0.0338

• 29.56666667

Answer explanation

35.48 goes under the division symbol(house)

Move the decimal on the 1.2 to the end

Move the decimal on the 35.48 the same number of times

Tags

CCSS.6.NS.B.2

CCSS.6.NS.B.3

My turtle can travel 4 miles in 8 hours. What is his speed in miles per hour?

• 2 mph

• 0.25 mph

• 5 mph

• 0.5 mph

Answer explanation

Miles PER hour means

Miles ÷ hours

Tags

CCSS.3.OA.A.2

CCSS.3.OA.D.8