Solving Decimal Word Problems: Addition and Subtraction

The video tutorial covers adding and subtracting decimals through word problems. It introduces annotating techniques to identify key operations and solve problems effectively. Several examples are provided, demonstrating both addition and subtraction in various contexts, such as app sizes, chip bags, walking distances, running distances, candy weights, and file sizes. The tutorial emphasizes the importance of understanding keywords and using critical thinking to determine the correct operation.

What is the main focus of today's lesson?

• Converting decimals to fractions

• Adding and subtracting decimals in word problems

• Dividing decimals

• Multiplying decimals

Which keyword indicates an addition problem?

• Less

• Missing

• Left

• Total

What should you do first when annotating a word problem?

• Circle the keywords

• Highlight the question

• Draw a picture

• Underline the numbers

In the problem where Isabelle downloaded two apps, what operation is needed to find the size of the other app?

• Subtraction

• Addition

• Division

• Multiplication

If H bought 63.55 oz of barbecue chips and 63.9 oz of regular chips, how many ounces did she buy in total?

• 127.45 oz

• 127.55 oz

• 127.35 oz

• 127.45 oz

Paul walked 5.02 km in two days. If he walked 1.52 km on the first day, how far did he walk on the second day?

• 3.40 km

• 3.70 km

• 3.60 km

• 3.50 km

Henry bought 7.91 lbs of jelly beans. If 4.81 lbs were cherry flavor, how many pounds were lime flavor?

• 3.30 lbs

• 3.00 lbs

• 3.20 lbs

• 3.10 lbs

John and Gwen ran a total of 17.97 miles. If John ran 12.27 miles, how far did Gwen run?

• 5.90 miles

• 5.60 miles

• 5.70 miles

• 5.80 miles

A soda has 32.78% of the daily sodium value and fries have 35.3%. How much sodium do they have together?

• 68.98%

• 68.88%

• 68.18%

• 68.08%

Roger and his brother received 9.29 kg of candy. If Roger's amount was 2.89 kg, how much was his brother's?

• 6.30 kg

• 6.40 kg

• 6.50 kg

• 6.20 kg