Exploring Expanded Notation and Elapsed Time in Saxon Math

This video tutorial covers lesson 31 of Saxon Math, focusing on expanded notation and elapsed time. It begins with an introduction to expanded notation, explaining how to express numbers by multiplying each digit by its place value. The video provides examples of converting numbers between standard and expanded notation. It then introduces the concept of elapsed time, explaining how to calculate the time difference between two events using subtraction. The tutorial includes examples and practice problems to reinforce these concepts, helping students understand and apply expanded notation and elapsed time calculations.

What is the place value of the digit 2 in the number 270,000?

• Hundreds

• Hundred thousands

• Thousands

• Ten thousands

How do you write 27,000 in expanded notation?

• 2 x 1,000 + 7 x 100

• 2 x 1,000 + 7 x 10,000

• 2 x 10,000 + 7 x 1,000

• 2 x 100,000 + 7 x 10,000

Which of the following is the expanded notation for 27,080?

• 2 x 10,000 + 7 x 1,000 + 8 x 100

• 2 x 1,000 + 7 x 100 + 8 x 10

• 2 x 10,000 + 7 x 1,000 + 8 x 10

• 2 x 100,000 + 7 x 10,000 + 8 x 1,000

Convert the expanded notation 5 x 1,000 + 2 x 100 + 8 x 10 to standard notation.

• 5,082

• 5,820

• 5,208

• 5,280

What is the standard notation for 6 x 1,000 + 4 x 100?

• 6,040

• 6,004

• 6,400

• 6,044

How many hours are there in the PM part of the day?

• 24 hours

• 6 hours

• 12 hours

• 10 hours

If Jason started a marathon at 7:15 AM and finished at 11:10 AM, how long did it take him?

• 4 hours and 5 minutes

• 4 hours and 15 minutes

• 3 hours and 45 minutes

• 3 hours and 55 minutes

What time is 2.5 hours after 10:43 AM?

• 12:43 PM

• 1:13 PM

• 1:43 PM

• 2:13 PM

What is the expanded notation for the number 705?

• 7 x 100 + 5 x 1

• 7 x 10 + 5 x 1

• 7 x 1,000 + 5 x 10

• 7 x 100 + 5 x 10

If Dakota got home from soccer practice 4.5 hours before she went to sleep at 10 PM, what time did she get home?

• 7:30 PM

• 4:30 PM

• 6:30 PM

• 5:30 PM