Adding and Subtracting Decimals Word Problems

Front

What is a decimal?

Back

A decimal is a fraction whose denominator is a power of ten, represented with a decimal point. For example, 0.5 is a decimal that represents 5/10.

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 sum of 7.45 and 5.21?

Back

12.66

Front

What is the total weight of two samples weighing 39.05 grams and 56.7 grams?

Back

95.75 grams

Front

If Ellie buys supplies for $6.43 and pays with a $20 bill, how much change does she receive?

Back

$13.57

Front

What is the total mass of rocks weighing 31.6 grams and 45.2 grams?

Back

76.8 grams

Front

How do you find the total of multiple decimal values?

Back

Add all the decimal values together, ensuring to align the decimal points.

Front

What is the total travel time if the Bell family drove for 10.9 hours, 8.6 hours, and 12.4 hours?

Back

31.9 hours

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.