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 result of 19.6 + 4.31?

Back

23.91

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 result of 36 - 7.3?

Back

28.7

Front

What is the total time if an athlete swims laps in 54.73, 54.56, 54.32, and 54.54 seconds?

Back

218.15 seconds

Front

How do you find change from a purchase?

Back

To find change, subtract the total cost of the items from the amount paid. For example, if you pay $50.00 for items costing $25.15, the change is $50.00 - $25.15 = $24.85.

Front

What is the result of 19.21 + 11.03?

Back

30.24

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 does it mean to round a decimal?

Back

Rounding a decimal means adjusting it to a nearby value that is simpler or easier to work with, often to a certain number of decimal places.