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 answer directly below the other decimal points.

Front

What is the result of 55.78 + 4.6?

Back

60.38

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 answer directly below the other decimal points.

Front

What is the result of 94 - 4.8?

Back

89.2

Front

If a race is 22.01 kilometers and one runner runs 9.41 kilometers, how do you find out how far the other runner ran?

Back

Subtract the distance run by the first runner from the total distance: 22.01 - 9.41 = 12.6 kilometers.

Front

What is the result of 21 + 4.09?

Back

25.09

Front

What do the decimal numbers 3.49 and 4.60 represent in money?

Back

They represent amounts of money, specifically $3.49 and $4.60.

Front

What is the importance of aligning decimal points when adding or subtracting?

Back

Aligning decimal points ensures that each digit is in the correct place value, which is crucial for accurate calculations.

Front

What is a common mistake when adding decimals?

Back

A common mistake is not aligning the decimal points, which can lead to incorrect sums.