Estimating and Multiplying Decimals

The video tutorial explains how to multiply decimals by first ignoring the decimal points and calculating the product of the digits. It then uses estimation to determine the correct placement of the decimal point in the final answer. The importance of estimation is highlighted with a real-world example of a costly mistake due to incorrect decimal placement.

What is the first step suggested to solve the multiplication of 2.8 and 4.73?

• Ignore the decimal points and multiply the digits.

• Estimate the product by rounding the numbers.

• Use a calculator to find the exact answer.

• Directly multiply the numbers with decimals.

When multiplying 473 by 28, what is the result of 3 times 8?

• 24

• 28

• 36

• 32

What is the sum of 1 plus 7 plus 4 in the multiplication process?

• 11

• 12

• 10

• 13

How do you estimate the product of 2.8 and 4.73?

• By rounding 2.8 to 2 and 4.73 to 4

• By rounding 2.8 to 3 and 4.73 to 5

• By rounding 2.8 to 3 and 4.73 to 4

• By rounding 2.8 to 2 and 4.73 to 5

What is the estimated product of 3 and 5?

• 18

• 15

• 12

• 10

Where should the decimal be placed in the product 13244 to make it reasonable?

• 1324.4

• 132.44

• 13.244

• 1.3244

Why is estimation important when dealing with decimals?

• It helps in understanding the exact answer.

• It ensures the answer is always correct.

• It helps in verifying the reasonableness of the answer.

• It eliminates the need for calculations.

What was the consequence of getting the decimal wrong in a stock trade?

• The trader sold fewer shares than intended.

• The trader bought more shares than intended.

• The trader lost hundreds of millions of dollars.

• The trader made a huge profit.

What is the key takeaway from the video regarding decimals?

• Decimals can be ignored in most calculations.

• Estimation is not necessary for decimals.

• Correct decimal placement is crucial to avoid errors.

• Decimals are not important in calculations.

What should you do if you forget the method for multiplying decimals?

• Ask someone else.

• Ignore the decimals.

• Rely on estimation.

• Use a calculator.