Adding and Subtracting Decimals

Front

What is a decimal?

Back

A decimal is a number that includes a decimal point, which separates the whole number part from the fractional part.

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 value of 56.21 - 7.89?

Back

The value is 48.32.

Front

What is the difference between 39.3 and 17.6?

Back

The difference is 21.7.

Front

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

Back

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.

Front

What is 29.74 rounded to the nearest whole number?

Back

30.00

Front

How do you convert pounds to kilograms?

Back

To convert pounds to kilograms, multiply the weight in pounds by 0.453592.

Front

What is the difference in weight between 12.3 pounds and 8.47 pounds?

Back

The difference is 3.83 pounds.

Front

How do you round a number to the nearest hundred?

Back

Look at the tens digit. If it is 5 or greater, round up; if it is less than 5, round down.