Decimal Operations

Front

What is a decimal?

Back

A decimal is a fraction whose denominator is a power of ten, represented with a decimal point. For example, 0.5 is a decimal representation of 5/10.

Front

How do you add decimals?

Back

To add decimals, align the numbers by the decimal point and add as you would whole numbers, placing the decimal point in the sum directly below the other decimal points.

Front

How do you subtract decimals?

Back

To subtract decimals, align the numbers by the decimal point and subtract as you would whole numbers, placing the decimal point in the difference directly below the other decimal points.

Front

What is the process for multiplying decimals?

Back

To multiply decimals, multiply the numbers as if they were whole numbers, then count the total number of decimal places in both factors and place the decimal point in the product accordingly.

Front

How do you divide decimals?

Back

To divide decimals, move the decimal point in the divisor to the right to make it a whole number, and move the decimal point in the dividend the same number of places. Then divide as you would with whole numbers.

Front

What is rounding?

Back

Rounding is the process of adjusting the value of a number to make it simpler while keeping it close to the original value. For example, rounding 2.74 to the nearest whole number gives 3.

Front

What is the value of 29.95 x 8.7?

Back

The value is 260.565, which rounds to 260.57 when rounded to the nearest cent.

Front

What is the average speed if Xander traveled 8,568 miles in 17 days?

Back

The average speed is 504 miles per day, calculated by dividing 8568 by 17.

Front

How do you calculate change from a purchase?

Back

To calculate change, subtract the total cost of the purchase from the amount given. For example, if Jenna buys gummi bears for $2.74 and pays with $10, her change is $10 - $2.74 = $7.26.

Front

What is 26.73 ÷ 9.0?

Back

The result is 2.97.