Adding and Subtracting Decimals Mastery

This video tutorial for sixth graders covers the basics of adding and subtracting decimals. It begins with an introduction to the topic, followed by practical examples from the sports world, specifically swimming events. The tutorial emphasizes the importance of lining up decimal points and place values when performing operations. Students are guided through practice problems to reinforce their understanding. The lesson concludes with real-world applications and a guided practice session to ensure comprehension.

What is the learning standard being focused on in this lesson?

• Fluently adding and subtracting multi-digit decimals

• Understanding fractions

• Solving algebraic equations

• Learning about geometry

If Elizabeth Trickett's time is 56.73 seconds and Christine Magnuson took 0.37 seconds longer, what is Christine's time?

• 57.00 seconds

• 57.10 seconds

• 56.73 seconds

• 56.36 seconds

When adding decimals, what is the first step you should always do?

• Add the numbers directly

• Round the numbers

• Line up the decimal points

• Convert to fractions

What is the sum of 23.1 and 5.8?

• 27.9

• 29.1

• 28.9

• 30.1

How do you check for reasonableness in your answer when adding decimals?

• By multiplying the numbers

• By rounding the numbers and adding

• By subtracting the numbers

• By converting to fractions

What is the difference between 72.34 seconds and 58.10 seconds?

• 15.24 seconds

• 14.24 seconds

• 13.24 seconds

• 16.24 seconds

When subtracting decimals, what might you need to do if there are not enough digits?

• Round the numbers

• Annex zeros

• Add more numbers

• Convert to fractions

What is the result of 9.543 minus 3.67?

• 5.872

• 5.873

• 5.871

• 5.870

If a video clip is 22.36 minutes long and another is 17.03 minutes long, what is the total length of the video?

• 39.39 minutes

• 39.37 minutes

• 39.40 minutes

• 39.38 minutes

How much farther does Jonathan need to travel if he has already driven 208.62 miles out of a total of 589.4 miles?

• 380.79 miles

• 380.78 miles

• 380.77 miles

• 380.76 miles