Adding and Subtracting Numbers in Scientific Notation (Part 2)

The video tutorial explains how to evaluate expressions using scientific notation. It begins by rewriting numbers to have the same power of 10, then performs subtraction. The result is adjusted to proper scientific notation by moving the decimal point and adjusting the power of 10 accordingly. The tutorial emphasizes the relationship between decimal point movement and changes in the power of 10.

What is the first step in rewriting 9 and 0.1 times 10 to the power of 8 to have the same power of 10 as 1 and 0.5 times 10 to the power of 9?

• Subtract 1 from the exponent

• Divide by 10

• Multiply by 10

• Add 1 to the exponent

After rewriting the numbers, what is the result of subtracting 0.91 times 10 to the power of 9 from 1.5 times 10 to the power of 9?

• 1.41 times 10 to the power of 8

• 1.41 times 10 to the power of 9

• 0.59 times 10 to the power of 8

• 0.59 times 10 to the power of 9

How do you adjust the decimal point to express 0.59 times 10 to the power of 9 in proper scientific notation?

• Move the decimal point 2 places to the left

• Move the decimal point 1 place to the right

• Move the decimal point 2 places to the right

• Move the decimal point 1 place to the left

What happens to the power of 10 when you move the decimal point to the left in scientific notation?

• The power of 10 doubles

• The power of 10 increases

• The power of 10 remains the same

• The power of 10 decreases

If you move the decimal point to the right three times, what adjustment should be made to the exponent in scientific notation?

• Decrease the exponent by 1

• Increase the exponent by 3

• Increase the exponent by 1

• Decrease the exponent by 3