Add, Subtract, Multiply, and Divide Decimals

Adding Decimals

100

Do you line up decimals when you add?

yes

200

Add:

72381.34 + 89032.452 = ? 

161413.792

300

Add

23.99 + 6.99 = 

30.98

400

Add

204.15  +  1.29

205.44

500

Add

105 + 54.77 =

159.77 

Subtracting Decimals

100

Do you line up decimals when you subtract?

yes

200

Subtract: 

4.75891 - 2.8329 = ?

1.92601

300

subtract

6.054 - 0.61

5.444

400

Subtract

75.88 - 3.44 =

72.44

500

DAILY DOUBLE

100 - 33.55 =

66.45

Multiplying Decimals

100

Do you line up decimals when you multiply?

no

200

Multiply:

28.23 * 4

112.92

300

Multiply: 

25.12 * 2

50.24

400

6.012 x 3

18.036

500

Multiply:

810.54 × 6

4,863.24

TEACHER'S CHOICE

100

What is Mr. Pothast's Golden Retriever's name?

Summer

200

In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover exactly half of the lake?

47 days

300

I have a pound of iron and a pound of feathers. I put them both on a scale. Which one is heavier?

Neither, they weigh the same.

400

Think of any number. Multiply it by 9. Add the digits of the answer together, what number do you get?

9

500

Which three numbers give the same result whether they are added together or multiplied together?

1, 2, & 3