Mastering Multiplication of Decimals and Whole Numbers

What is the product of 5 and 0.42?

• 2.1

• 4.2

• 21

• 0.21

When multiplying decimals, do you need to line up the decimal points?

• No, never

• Yes, always

• Only sometimes

• Only if the numbers are large

How many decimal places should the product of 5 and 0.42 have?

• 3

• 1

• 2

• None

What is the product of 4 and 12.3?

• 49.2

• 123.4

• 492

• 4.92

How many decimal places should the product of 4 and 12.3 have?

• 1

• None

• 2

• 3

What should you do after multiplying the numbers to place the decimal correctly?

• Add the number of decimal places in the factors

• Subtract the number of decimal places in the factors

• Ignore the decimal places

• Multiply the number of decimal places in the factors

If a recipe calls for 0.75 cups of rice per person, how much rice is needed for 6 people?

• 6.5 cups

• 5.5 cups

• 3.5 cups

• 4.5 cups

Harold has 2.5 cups of rice but needs 4.5 cups. How much more rice does he need to buy?

• 4 cups

• 3 cups

• 2 cups

• 1 cup

When subtracting decimals, what is important to remember?

• Line up the decimal points

• Add extra zeros

• Ignore the decimal points

• Multiply the decimal points

What is the first step in solving the problem of how much more rice Harold needs?

• Divide the amount needed per person by the number of people

• Multiply the amount needed per person by the number of people

• Subtract the amount he has from the amount he needs

• Add the amount he has to the amount he needs