Decimal Operations Quiz

What is the Most important rule when adding or subtracting?

• Line up the last digits.

• Line up the decimals.

• Remember to borrow or regroup.

• Don't back down!

If the dividend is a whole number I do not have to move any decimals.

• True

• False

Answer explanation

The dividend is inside the house. You only move the decimals if the divisor has a decimal.

When multiplying decimals you MUST line up the decimals!

• True

• False

Answer explanation

You do NOT line up the decimals when multiplying or dividing.

If the divisor is a whole number in a division problem I do not have to move any decimals.

• True

• False

12*.9

7.2/.09

16.3-.25

.45/.9

Ellen wanted to buy the following items:

- A DVD player for $49.95

- A DVD holder for $19.95

- Personal stereo for $21.95

Does Ellen have enough money to buy all three items if she has $90.

• Yes she does because she only needs $90 and the total of the items gives her $1.85 left over.

• No she does NOT because she only has $90 and the total of the items is $1.85 more than what she can afford.

Melissa purchased $39.46 in groceries at a store. The cashier gave her $1.46 in change from a $50 bill. How much change should the cashier have given Melissa?

• $1.46

• $10.00

• $10.54

• $11.00