Adding, Subtracting, and Multiplying Decimals

Adding, Subtracting, and Multiplying Decimals

Multiple Choice

Adding and Subtracting decimals is very similar.

• True

• False

Adding or Subtracting

When adding or subtracting decimals it is very important to line up the decimal, meaning you need to write the numbers with the decimals right on top of each other.

Multiple Choice

When adding decimals it doesn't matter which number goes on top.

• True

• False

Multiple Choice

Add 63.547 and 2.88

• 65.545

• 67.427

• 66.427

• 67.575

Multiple Choice

When subtracting decimals its important to write the number with the biggest value on top.

• True

• False

How do I deal with a whole number?

When you are given a whole number, it is important to put the decimal after the last digit.

Multiple Select

What is the decimal equivalent of 57

• .57

• 5.7

• 57.

• 57.0

• 57.00

When subtracting integers the number of digits does not matter

4.57986 has more digits that 10.8 but 10.8 has more value

Multiple Choice

If I want to subtract 49.235 and 4.9235 which number goes on top?

• 49.235

• 4.9235

Multiple Choice

Subtract 82.7 - 4.59

• 72.29

• 78.29

• 77.11

• 78.11

Multiple Choice

subtract 10 and 2.542

• 8.542

• 7.458

• 8.458

• 7.568

When Multiplying Decimals

It is important to pretend the decimal is not there until the end.

Multiply regularly

Count how many digits are after the decimal. That is how many should be in your answer.

Multiple Choice

How many digits should be after the decimal in my answer if I multiply 45.899 and 4.999?

• 3

• 4

• 5

• 6

Multiple Choice

How many digits should be after the decimal in my answer if I multiply 2.95 and 3.2?

• 4

• 3

• 2

• 1

Multiple Choice

How many digits should be after the decimal in my answer if I multiply 200 and 5.72?

• 0

• 1

• 2

Multiple Choice

Multiply the following:

5.9 and 0.3

• 17.7

• 1.77

• .177

Multiple Choice

Multiply 15 and 0.9

• 135

• 1.35

• 13.5

Multiple Choice

Multiply 15.7 and 2.9

• 45.53

• 4.553

• .4553