Rounding and Comparing Decimals

This video tutorial introduces decimal notation, explaining how to read, write, compare, order, and round decimal numbers. It covers the use of decimal points to separate whole numbers from fractions and demonstrates converting decimals to fractions. The tutorial also provides methods for comparing and ordering decimals, emphasizing the importance of place value. Finally, it explains the process of rounding decimals, including identifying the roundoff digit and deciding whether to round up or down.

What does the decimal point in a number signify?

• It is used to multiply numbers.

• It shows the number is a fraction.

• It indicates the number is negative.

• It separates whole numbers from fractions.

How would you read the decimal 6.3?

• Six and three tenths

• Six point three

• Six and three hundredths

• Sixty-three

What is the improper fraction form of 52.12?

• 521/2

• 5212/100

• 52/12

• 5212/10

When comparing decimals, why might you add zeros to the right?

• To obtain a common denominator

• To make the numbers look bigger

• To change the value of the number

• To make the numbers look smaller

Which of the following is true when ordering decimals?

• Decimals with more zeros are larger.

• The smallest numbers are to the left on the number line.

• The number with more digits is always larger.

• Negative numbers are always larger.

How do you determine which decimal is larger when they have the same whole number?

• Compare the number of digits.

• Compare the tenths place.

• Compare the thousandths place.

• Compare the hundredths place.

What is the first step in rounding a decimal?

• Add zeros to the right.

• Identify the roundoff digit.

• Compare with other numbers.

• Convert to a fraction.

If the digit to the right of the roundoff place is 5 or more, what should you do?

• Round up.

• Round down.

• Add a zero.

• Leave the number unchanged.

What happens to the digits to the right of the roundoff place after rounding?

• They are doubled.

• They are dropped.

• They are added to the left.

• They are converted to zeros.

Why should you avoid adding extra zeros after rounding?

• It makes the number larger.

• It makes the number incorrect.

• It indicates a different rounding place.

• It changes the place value.