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

What is the sum of 10.9 and 8.6?

Back

19.5

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 7.9 - 3.47?

Back

4.43

Front

What is the difference between 435.2 and 24.55?

Back

410.65

Front

How do you find the difference between two decimal numbers?

Back

To find the difference, subtract the smaller number from the larger number.

Front

What is the result of 55.78 + 4.6?

Back

60.38

Front

If Chicago was predicted to receive 1.254'' of rain and actually received .875'', how do you find the difference?

Back

Subtract the actual amount from the predicted amount: 1.254 - 0.875 = 0.379.

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.