1. Scientific Notation A value written as a power of 10 A value written as a power of 10 Used to express very small or large numbers Used to express very small or large numbers Replaces extra zeroes, by moving the decimal point either to the left or to the right Replaces extra zeroes, by moving the decimal point either to the left or to the right

2. Scientific Notation Decimal point moved to the direct right of the first number that is not a zero Decimal point moved to the direct right of the first number that is not a zero The power of 10 = the number of places the decimal point is moved The power of 10 = the number of places the decimal point is moved  Decimal point moved to left = positive (+)  Decimal point moved to left = positive (+) power of 10 power of 10  Decimal point moved to right = negative (-)  Decimal point moved to right = negative (-) power of 10 power of 10

3. Scientific Notation Examples: 40,000 meters = 4.0 x 10 4 m 40,000 meters = 4.0 x 10 4 m  decimal point moved 4 places to the left  decimal point moved 4 places to the left 0.0005 meters = 5.0 x 10 -4 m 0.0005 meters = 5.0 x 10 -4 m  decimal point moved 4 places to the right  decimal point moved 4 places to the right  Powers of 10 10 0 = 1 10 2 = 100 10 1 = 10 10 3 = 1,000