Operations on decimal numbers

Match the following rules to the correct operation.

• Multiplication

• Line up the decimals.

• Addition/Subtraction

• Move the decimal over to make the outside number a whole number.

• Division

• You do not line up the decimals.

When do you line up your decimals?

• When solving addition and subtraction problems.

• When solving multiplication and division problems.

• All of the above.

• None of the above.

Answer to a subtraction problem

• sum

• difference

• product

• quotient

The answer to a subtraction problem

• sum

• difference

• product

• quotient

How do you subtract decimals

• I don't know

• add

• do not align decimals

• bring decimals point down. Subtract normally.

When adding and subtracting decimals, we ALWAYS line up the decimals.

• True

• False

The answer to a subtraction problem is

• product

• quotient

• sum

• difference

14 tenths - 5 tenths

In a whole number like 3, 4, 5, etc., where can you put a decimal to help you solve an addition or subtraction problem?

• You can't put a decimal in a whole number

• at the beginning

• at the end

• A decimal just shows up in the calculator

The rule for:

Subtraction-

• When subtracting with decimals, line the decimals up in the question.

• When subtracting with decimals, line the decimals up in the question and answer.

• When subtracting with decimals, leave the decimal until the end. Count the number of decimal places in your question and put the same number in your answer.

• When subtracting with decimals, leave the decimal until the end. Put the decimal in the answer above where it its in the question (dividend).