MCA Math Review 5th Grade Add and Subtract Decimals

What is 18.19 + 0.01?

• 18.1

• 18.191

• 18.2

• 18.291

Answer explanation

Don't forget to line up your decimals when you add!

1

18.19

+ 0.01

18.20

The amount of water in a jar at the beginning of a day is 0.482 liter. During the day, 0.1 liter evaporates. What is the amount of water in the jar at the end of the day?

• 0.382 liter

• 0.481 liter

• 0.472 liter

• 0.582 liter

Answer explanation

Don't forget to line up your decimals when solving the problem! If water evaporates, we are taking it away!

Add zeros to help you line up the numbers!

0.482

-0.100

0.382

What is the sum?

14.030

+ 0.001

• 14.031

• 14.04

• 14.301

• 14.31

Answer explanation

DON'T FORGET TO LINE UP YOUR DECIMALS!

Add a zero to help you line them up!

14.030

+ 0.001

14.031

What is 11.01 - 0.001

• 11

• 11.001

• 11.009

• 11.099

Answer explanation

Don't forget to line up your decimals! Add a zero to help you line up your numbers!

0 10

11.010

- 0.001

11.009

What is the difference?

10.211

- 0.01

• 10.111

• 10.201

• 10.21

• 10.221

Answer explanation

Remember, adding a zero can help to line up your numbers AND can make sure you don't skip the thousandths place!

10.211

- 0.010

10.201

A scientist weighs 18.193 grams of a substance. She then adds 0.1 gram of another substance to create a mixture. What is the combined weight of the mixture?

• 18.093 grams

• 18.194

• 18.203

• 18.293

Answer explanation

LINE UP THE DECIMALS Add hundredths and thousandths to help you.

18.193

- 0.100

18.093

What is 1.121 + 0.001?

• 1.12

• 1.122

• 1.131

• 1.211

Answer explanation

LINE UP YOUR DECIMALS! Add zeros to help you!

1.121

+0.001

1.122

What is 9.09 - 0.1?

• 8.99

• 9.08

• 9.089

• 9.99

Answer explanation

LINE UP YOUR DECIMALS! Add zeros to help!

8 10

9.09

-0.10

8.99