Adding and Subtracting Decimals Word Problems

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, 2.5 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 importance of place value in decimals?

Back

Place value in decimals indicates the value of each digit based on its position relative to the decimal point. For example, in 3.45, the 4 is in the tenths place and the 5 is in the hundredths place.

Front

How do you convert feet to inches?

Back

To convert feet to inches, multiply the number of feet by 12, since there are 12 inches in a foot.

Front

If a block measures 2.5 inches, how many blocks are needed to reach 5 feet?

Back

To find the number of blocks, first convert 5 feet to inches (5 feet x 12 inches/foot = 60 inches). Then divide 60 inches by 2.5 inches/block, which equals 24 blocks.

Front

What does it mean for one time to be slower than another?

Back

If one time is slower than another, it means that it takes longer to complete the task. For example, if Matt's time is 26.03 seconds and Ryan's is 0.45 seconds slower, Ryan's time is 26.48 seconds.

Front

How do you find the difference between two heights?

Back

To find the difference between two heights, subtract the shorter height from the taller height. For example, Lacy's height (51.25 inches) minus Gerald's height (46.65 inches) equals 4.6 inches.

Front

What is the formula to calculate change returned after a purchase?

Back

The formula to calculate change is: Change = Amount Given - Cost of Item. For example, if Maria gives $10.00 for a lock that costs $6.27, her change is $3.73.

Front

How do you determine how much faster one time is compared to another?

Back

To determine how much faster one time is, subtract the faster time from the slower time. For example, Timmy's first race time (15.674 seconds) minus his second race time (14.978 seconds) equals 0.696 seconds.