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Do Now Evaluate each expression. 1. 123 1,000 123,000 2. 123 1,000 0.123 3. 0.003 100 0.3 4. 0.003 100 0.00003 Scientific notation is a method of writing numbers that are very large or very small. A number written in scientific notation has two parts that are multiplied. The first part is a number that is greater than or equal to 1 and less than 10. The second part is a power of 10. Astronomy Application Saturn has a diameter of about Its distance from the Sun is about 1,427,000,000 km. km. Write Saturn’s diameter in standard form. 120000 120,000 km Move the decimal point 5 places to the right. Astronomy Application Saturn has a diameter of about Its distance from the Sun is about 1,427,000,000 km. km. Write Saturn’s distance from the Sun in scientific notation. 1,427,000,000 1,4 2 7,0 0 0,0 0 0 9 places 1.427 9 10 km The direction When to move the decimal to the right or the left.