Decimals

What is a decimal?

• A whole number that can be expressed without a fraction.

• A fraction whose denominator is a power of ten, represented with a decimal point.

• A number that is always greater than one.

• A type of integer that includes negative values.

• 86.4

• 80.0

• 90.5

• 75.2

What is the difference between 5 and 2.391?

• 2.609

• 2.5

• 3.0

• 2.2

What is the sum of two decimals?

• The sum is found by aligning the decimal points and adding as you would with whole numbers.

• The sum is simply the product of the two decimals.

• The sum is the difference between the two decimals.

• The sum is always greater than the larger decimal.

How do you multiply a decimal by 10?

• Move the decimal point one place to the left.

• Move the decimal point one place to the right.

• Add a zero to the end of the decimal.

• Multiply the decimal by 100.

What is the place value of the digit 9 in 4.099?

• In the ones place

• In the tenths place

• In the hundredths place

• In the thousandths place

How do you convert a decimal to a fraction?

• Write the decimal over its place value and simplify (e.g., 0.75 = 75/100)

• Multiply the decimal by 10 and round to the nearest whole number

• Add the decimal to 1 and write it as a fraction

• Convert the decimal to a percentage and use that as the numerator

What is rounding?

• Rounding is the process of adjusting the digits of a number to make it simpler while keeping its value close to what it was.

• Rounding is the process of increasing the value of a number to the next highest integer.

• Rounding is the method of converting a number into a fraction.

• Rounding is the technique of multiplying a number by ten to simplify it.

How do you round a decimal to the nearest whole number?

• Look at the digit to the right of the decimal point. If it is 5 or greater, round up. If it is less than 5, round down.

• Always round up regardless of the digit to the right of the decimal point.

• Round down if the digit to the right of the decimal point is 4 or less, and round up if it is 6 or greater.

• Ignore the digit to the right of the decimal point and keep the whole number as is.

What is the rule for multiplying decimals?

• Count the total number of decimal places in both numbers, multiply as if they were whole numbers, and then place the decimal in the result.

• Multiply the numbers without considering the decimal places and then add the decimal point at the end.

• Multiply the numbers as whole numbers and ignore the decimal places completely.

• Count the decimal places in the first number only, multiply, and then place the decimal in the result.