2/10 Scientific Notation 4

When writing a number in scientific notation, the first number must be greater than 1, but less than 10.

• False
• True

Which of the following is NOT true of scientific notation?

• The number in front must be between 1 and 9.9
• The exponent tells you how many times the decimal was moved
• It shortens big numbers
• It doesn't always contain x10

Change from standard form to scientific notation: 12,000,000

• 12.0  x  10⁷
• 0.12  x  10⁷
• 1.2  x  10⁶
• 1.2  x  10⁷

Try to change the number back to standard form:  6.79  x  10⁴

• 679,000
• 6,790
• 67,900
• 6,790,000

Change from standard form to scientific notation:  0.000398

• 39.8  x  10^-5
• 3.98  x  10^-5
• 3.98  x  10^-4
• 39.8  x  10^-6

Try to change the number back to standard form: 3.97  x  10^-2

• 0.000397
• 0.0397
• 0.0000397
• 0.397

When adding numbers in scientific notation what must you do to the exponents?

• Make sure they are the same, or get them the same if they are not.

• Add them silly!

• Multiply them, duh!

(2 x 10^-5)+ (7 x 10^-5)

• 9 x 10^-10
• 14 x 10^-5
• 9 x 10^-5
• 1.4 x 10^-4

When subtracting numbers in scientific notation, what must you do to the exponents?

• Make sure they are the same, or make them the same if they are not.

• Subtract them silly!

• Divide them, duh!

(8 x 10⁴) - (2 x 10⁴)

• 16 x 10¹⁶
• 16 x 10⁸
• 6 x 10⁸
• 6 x 10⁴