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. For example, 3.14 is a decimal.

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 15 - 5.8?

Back

9.2

Front

What is the value of 7.2 - 3.57?

Back

3.63

Front

What is the value of 168 + 45.2?

Back

213.2

Front

What is the value of 42.1 - 6.9?

Back

35.2

Front

What is the value of 84.79 + 34.45?

Back

119.24

Front

What does it mean to 'round' a decimal?

Back

Rounding a decimal means adjusting its value to make it simpler while keeping it close to the original value. For example, rounding 3.76 to the nearest whole number gives 4.

Front

What is the place value of the digit 5 in 3.45?

Back

In 3.45, the digit 5 is in the hundredths place, which means it represents 5/100 or 0.05.