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, 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

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 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 2.56, the 5 is in the tenths place and the 6 is in the hundredths place.

Front

What is the first step in solving a word problem involving decimals?

Back

The first step is to read the problem carefully and identify what is being asked.

Front

How do you convert a dollar amount to cents?

Back

To convert a dollar amount to cents, multiply the dollar amount by 100. For example, $7.96 is 796 cents.

Front

What is the process to find change from a purchase?

Back

To find change, subtract the total cost of the purchase from the amount paid. For example, if you pay $20 for a $7.96 item, the change is $20 - $7.96 = $12.04.

Front

How do you determine how much taller one person is than another using decimals?

Back

To find how much taller one person is than another, subtract the shorter person's height from the taller person's height. For example, if Lacy is 51.25 inches tall and Gerald is 46.65 inches tall, Lacy is 51.25 - 46.65 = 4.6 inches taller.

Front

What is the method to combine weights of two samples?

Back

To combine weights, simply add the weights of the two samples together. For example, if one sample weighs 39.05 grams and another weighs 56.7 grams, the total weight is 39.05 + 56.7 = 95.75 grams.

Front

How do you solve for an unknown in an equation involving decimals?

Back

To solve for an unknown, isolate the variable by performing the same operation on both sides of the equation. For example, in 216.12 = 0.2 + 16.01 + ?, you would subtract 0.2 and 16.01 from 216.12 to find the unknown.