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 does 'less than' mean in a word problem?

Back

'Less than' indicates subtraction. For example, if something is '3 less than 5', it means 5 - 3.

Front

If it rained 0.72 inches on Monday and 0.34 inches less on Tuesday, how do you find Tuesday's rainfall?

Back

Subtract 0.34 from 0.72: 0.72 - 0.34 = 0.38 inches.

Front

How do you find the total amount of money before a purchase?

Back

Add the amount spent to the amount left. For example, if Larry spent $64.90 and has $3.96 left, he had $64.90 + $3.96 = $68.86.

Front

What is the process to find the total height grown over two years?

Back

Add the height grown in each year. For example, if someone grew 4.62 cm in the first year and 7.7 cm in the second year, the total growth is 4.62 + 7.7 = 12.32 cm.

Front

In a relay race, how do you find the distance run by the second runner?

Back

Subtract the distance run by the first runner from the total distance. For example, if the total race is 22.01 km and the first runner ran 9.41 km, the second runner ran 22.01 - 9.41 = 12.6 km.

Front

What is the importance of aligning decimal points in calculations?

Back

Aligning decimal points ensures accuracy in addition and subtraction, as it keeps the place values correct.

Front

What is a word problem?

Back

A word problem is a mathematical problem expressed in words, requiring interpretation and problem-solving skills to find a solution.