Math Review Topic 1-4

Front

What is the total change received when spending $3.24 and $1.67 from a $10 bill?

Back

To find the change, add the costs: $3.24 + $1.67 = $4.91. Then subtract from $10: $10 - $4.91 = $5.09.

Front

How do you multiply decimal numbers, such as 24.1 and 5.6?

Back

Multiply as whole numbers (241 x 56 = 13496) and then place the decimal point in the result based on the total number of decimal places in the factors (1 + 1 = 2), giving 134.96.

Front

What is the standard form of a decimal number?

Back

The standard form is a way of writing numbers using digits. For example, nine hundred five and three tenths is written as 905.3.

Front

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

Back

Look at the first decimal place. If it is 5 or more, round up. If it is less than 5, round down. For example, 78.256 rounds to 78.

Front

What is the process for rounding to the nearest hundredth?

Back

Look at the third decimal place. If it is 5 or more, round up the second decimal place. If it is less than 5, keep the second decimal place the same. For example, 6.127 rounds to 6.13.

Front

What is the formula to calculate change after a purchase?

Back

Change = Amount given - Total cost of items purchased.

Front

What is the significance of decimal places in multiplication?

Back

The number of decimal places in the product is equal to the sum of the decimal places in the factors.

Front

How do you convert a mixed number to standard form?

Back

A mixed number is converted to standard form by multiplying the whole number by the denominator and adding the numerator, then placing it over the denominator.

Front

What is the difference between standard form and scientific notation?

Back

Standard form is a way of writing numbers using digits, while scientific notation expresses numbers as a product of a number between 1 and 10 and a power of 10.

Front

How do you add decimal numbers?

Back

Align the decimal points and add as you would whole numbers, placing the decimal point in the sum directly below the other decimal points.