Adding, Subtracting, Multiplying & Dividing Decimals

Adding Decimals

100

It is important to -------------------------before you add decimals.

line up the decimal

200

3.205 + 11.726 =?

14.931

300

James bought a soda for $1.25 and a Big Mac for $2.43 at McDonalds. How much did he spend before tax was added?

$3.68

400

21.25 + 107.892 + 6.3

135.442

500

4.21 +37.002

41.212

Subtracting Decimal

100

When subtracting decimals it is a must to -------------------.

line up the decimals

200

45.3 - 21.72=?

23.58

300

67.35 - 2.597=?

64.753

400

Kelly's total bill at the grocery was $36.21. She paid with a 50 dollar bill. How much change will she get back?

$13.79

500

Marshall ran 2.7 miles on Monday. He ran 3.25 miles on Tuesday. On Wednesday, he ran 1.5 miles. How many more miles did he run on Monday and Tuesday compared to Wednesday?

4.45 miles

Powers of 10

100

What is 10^2?

100

200

What is 10 X 10 X 10 as an exponent?

10^3

300

1.23 X 1000= ?

1,230

400

723.45 divided by 100?

7.2345

500

5.24 X 10^3=?

5,240

Multiplying Decimals

100

The first rule of multiplying decimals is -------- the decimal.

ignore

200

3.24 X 0.4

1.296

300

After you multiply, the decimal must be added back into the answer. The answer will have ----------- number of digits behind the decimals as the numbers being multiplied.

the same

400

2.319 X 6.67

15.46773

500

125.31 X 10.215

1280.04165

Dividing Decimals

100

The first rule of dividing decimals is to ---------- the decimal.

ignore

200

34.5 divided by 5?

6.9

300

Cassy has 12.34 oz of milk. She wants to share it with her friend Carol. How much milk will Cassy and Carol each get if they share the milk equally?

6.17 oz of milk

400

9.04 divided by 0.08?

113

500

812.30 divided by 0.83?

978.674

978  674/1000