Decimal Computation

Place Value/Word Problems

100

2.569 

What digit is in the hundredths place?

6

200

15.209

What is the value of the 2?

two tenths or 0.2

300

I bought a hamburger for $2.50 and fries for $1.25.  Then I paid with a $5 bill.  How much change did I get back?

$1.25

400

I bought 3 pencils that each cost $0.72. Then I paid with a $5 bill.  How much change did I get back?

$2.84

500

Mrs. Hu went to dinner with 2 friends.  She ordered spaghetti for $8.95, one friend ordered chicken for $6.55, and the other friend ordered steak for $12.40.  If they split the bill, how much will they each pay? 

$9.30 

Adding Decimals

100

I bought a hot dog for $3.50 and a drink for $1.25.  How much did I spend?

$4.75

200

I got a piece of fabric that was 0.8 yards and a piece that was 1.3 yards.  How much did I buy in all?

2.1 yards

300

I bought a backpack for $22 and a pencil pouch for $3.75.  How much did I spend?

$25.75

400

In his chemistry experiment, Mr. Hu used 2.3 g of sodium and 11.5 g of choloride.  He also used 5.06 grams of water.  How many grams did he use in all?

18.86

500

What is the total of $52, $6.03, $4, and $0.89?  Tax is included?

$62.92

Subtracting Decimals

100

I had $6.25 and lost $1.05.  How much is left?

$5.20

200

I bought 5.7 yards of pink fabric and 2.4 yards of blue.  How much longer is the pink fabric than the blue?

3.3

300

I need a piece of wood that is 6.5 inches long.  Someone gave me a piece that was 12 inches long. How much do I need to cut off to have the right size?

5.5 inches

400

My bill at the restaurant was $11.78.  If I paid with a $20 bill, how much change would I get back if tax was included?

$8.22

500

There are 6.3 oz of juice left in the jug.  If there were originally 16 oz, how much did I drink?

9.7 oz

Multiplying Decimals

100

Product of 2 and 4.1

8.2

200

Product of 7 and 3.6

25.2

300

Product of 8.5 and 0.04

0.34

400

Product of 3.1 and 7.5

23.25

500

Product of 6.4 and 0.09

0.576