GRADED Decimal Multiplication

Front

What is decimal multiplication?

Back

Decimal multiplication is the process of multiplying numbers that include decimal points. It involves aligning the numbers, ignoring the decimal points during multiplication, and then placing the decimal point in the product based on the total number of decimal places in the factors.

Front

How do you multiply a whole number by a decimal?

Back

To multiply a whole number by a decimal, multiply as if there were no decimal point, then place the decimal point in the product. The decimal point is placed so that the total number of decimal places in the product equals the total number of decimal places in the factors.

Front

What is the formula to find the total cost of multiple items?

Back

Total Cost = (Number of Items) x (Cost per Item).

Front

If Bobby bought 10 pencils for $0.21 each, how do you calculate the total cost?

Back

Total Cost = 10 x $0.21 = $2.10.

Front

How do you calculate the total cost of multiple items with different prices?

Back

Add the total costs of each item. For example, if Olivia bought 4 books for $6.50 each and 3 bookmarks for $1.25 each, calculate: (4 x $6.50) + (3 x $1.25).

Front

What is the total cost if you buy 4.1 pounds of candy at $2.94 per pound?

Back

Total Cost = 4.1 x $2.94 = $12.06, which is between $11 and $12.

Front

How do you find out how much more money you need to reach a goal?

Back

Subtract the amount you have earned from your goal. For example, if Riley wants to earn $50 and has earned $30.80, she needs $50 - $30.80 = $19.20 more.

Front

What is the cost of a movie trip for 4 friends if one ticket costs $8.50 and popcorn costs $3.35?

Back

Total Cost = (4 x $8.50) + (4 x $3.35) = $34.00 + $13.40 = $47.40.

Front

What is the importance of estimating in decimal multiplication?

Back

Estimating helps to quickly assess whether an answer is reasonable and can guide you in checking your work.

Front

What is a decimal point?

Back

A decimal point is a dot used to separate the whole number part from the fractional part in a decimal number.