1530794 314900 15 5 3 an approximate answer to this

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Unformatted text preview: rm: Now you have the single digit 3 to the left of the decimal in the denominator. Step 4: Focus only on the whole number parts of the numerator and denominator and solve. 15.30794 3.14900 15 =5 3 An approximate answer to this complex division problem is 5. If this answer is not precise enough, keep one more decimal place and do long division (eg., 153 31 4.9). * Manhattan GMAT Prep the new standard 17 Chapter 1 DIGITS & DECIMALS STRATEGY Decimal Operations ADDITION AND SUBTRACTION To add or subtract decimals, make sure to line up the decimal points. Then add zeroes to make the right sides of the decimals the same length. 4.319 + 221.8 Line up the decimal points and add zeroes. 10 − 0.063 4.319 + 221.800 226.119 Line up the decimal points and add zeroes. 10.000 − 0.063 9.937 Addition & Subtraction: Line up the decimal points! The rules for decimal operations are different for each operation. MULTIPLICATION To multiply decimals, ignore the decimal point until the end. Just multiply the numbers as you would if they were whole numbers. Then count the total number of digits to the right of the decimal point in the factors. The product should have the same number of digits to the right of the decimal point. 0.02 × 1.4 Multiply normally: 14 ×2 28 There are 3 digits to the right of the decimal point in the factors (0 and 2 in the first factor and 4 in the second factor). Therefore, move the decimal point 3 places to the left in the product: 28 → 0.028. Multiplication: In the factors, count all the digits to the right of the decimal point— then put that many digits to the right of the decimal point in the product. If the product ends with 0, count it in this process: 0.8 × 0.5 = 0.40, since 8 × 5 = 40. If you are multiplying a very large number and a very small number, the following trick works to simplify the calculation: move the decimals in the opposite direction the same number of places. 0.0003 × 40,000 = ? Move the decimal point RIGHT four places on the 0.0003 → 3...
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