New SAT Math Workbook

007314 b 07314 c 7314 d 7314 e 7314 0008 43

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Unformatted text preview: ht (1000 has three zeros), and so forth. Example: The product of .837 and 100 is 83.7 Exercise 6 Find the following products. 1. 437 × .24 = (A) 1.0488 (B) 10.488 (C) 104.88 (D) 1048.8 (E) 10,488 5.06 × .7 = (A) .3542 (B) .392 (C) 3.92 (D) 3.542 (E) 35.42 83 × 1.5 = (A) 12.45 (B) 49.8 (C) 498 (D) 124.5 (E) 1.245 4. .7314 × 100 = (A) .007314 (B) .07314 (C) 7.314 (D) 73.14 (E) 731.4 .0008 × 4.3 = (A) .000344 (B) .00344 (C) .0344 (D) 0.344 (E) 3.44 5. 2. 3. www.petersons.com 8 Chapter 1 7. DIVISION OF DECIMALS When dividing by a decimal, always change the decimal to a whole number by moving the decimal point to the end of the divisor. Count the number of places you have moved the decimal point and move the dividend’s decimal point the same number of places. The decimal point in the quotient will be directly above the one in the dividend. Example: Divide 2.592 by .06 Solution: 43.2 .06 2.592 ) To divide a decimal by 10, 100, 1000, etc., we move the decimal point the proper number of places to the left. The number of places to be moved is always equal to the number of zeros in the divisor. Example: Divide 43.7 by 1000 Solution: The decimal point must be moved three places (there are three zeros in 1000) to the left. Therefore, our quotient is .0437 Sometimes division can be done in fraction form. Always remember to move the decimal point to the end of the divisor (denominator) and then the same number of places in the dividend (numerator). Example: Divide: .0175 1.75 = = .35 .05 5 Exercise 7 1. Divide 4.3 by 100. (A) .0043 (B) 0.043 (C) 0.43 (D) 43 (E) 430 Find the quotient when 4.371 is divided by .3. (A) 0.1457 (B) 1.457 (C) 14.57 (D) 145.7 (E) 1457 Divide .64 by .4. (A) .0016 (B) 0.016 (C) 0.16 (D) 1.6 (E) 16 4. Find .12 ÷ (A) (B) (C) (D) (E) 5. Find (A) (B) (C) (D) (E) 4.8 48 .03 0.3 3 10.2 .03 2 .5 . 2. ÷ 1.7 .1 . .02 0.2 2 20 200 3. www.petersons.com Operations with Whole Numbers and Decimals 9 8. THE LAWS OF ARITHMETIC Addition and multiplication are commutative...
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