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# Final NB 2016-2017 Turley

24 For addition and subtraction, look at the decimal portion (i.e., to the right of the decimal point) of the numbers ONLY. Here is what to do: 1) Count the number of significant figures in the decimal portion of each number in the problem. (The digits to the left of the decimal place are not used to determine the number of decimal places in the final answer.) 2) Add or subtract in the normal fashion. 3) Round the answer to the LEAST number of places in the decimal portion of any number in the problem. Solve the Problems and Round Accordingly... 1) 43.287 + 5.79 + 6.284 = _______ 55.361=55.36 2) 87.54 - 3.3 = _______ 84.24=84.2 3) 99.1498 + 6.5397 + 9.7 = _______ 214.5393= 214.5 4) 5.868 - 5.1 = _______ .768=.8 5) 59.9233 + 86.21 + 99.396 = _______ 245.5293=245.53 6) 7.7 + 26.756 = _______ 34.456=34.4 7) 66.8 + 2.3 + 4.8516 = _______ 73.9516=74 8) 9.7419 + 43.545 = _______ 53.2869=53.287 9) 4.8976 + 48.4644 + 1.514 = _______ 54.876 10) 4.335 + 35.85 = _______ 40.085=40.1 11) 9.448 - 1.7 = _______ 7.748=7.7 12) 75.826 - 8.6555 = _______ 67.1705=67.171 13) 57.2 + 23.814 = _______ 81.014=81 14) 77.684 - 4.394 = _______ 73.290 15) 26.4496 + 3.339 = _______ 29.7886=29.789 16) 9.6848 + 29.85 = _______ 39.5348=39.53 17) 63.11 + 2.5412 + 4.93 = _______ 70.5812=70.58 18) 11.2471 + 75.4 = _______ 86.6471=86.6 19) 73.745 - 8.755 = _______ 64.99 20) 6.5238 + 1.7 + 27.79 = _______ 36.0138

25 The following rule applies for multiplication and division: The LEAST number of significant figures in any number of the problem determines the number of significant figures in the answer. This means you MUST know how to recognize significant figures in order to use this rule. Solve the Problems and Round Accordingly... 1) 0.6 x 65.0 x 602 = __________ 20,000 2) 720 ÷ 7.7 = __________ 94 3) 929 x 0.3 = __________ 300 4) 300 ÷ 44.31 = __________ 7 5) 608 ÷ 9.8 = __________ 62 6) 0.06 x 0.079 = __________ .00 7) 0.008 x 72.91 x 7000 = __________ 4000 3,900,000 8) 73.94 x 67 x 780 = __________ 9) 0.62 x 0.097 x 40 = __________ 2 10) 600 x 10 x 5030 = __________ 30,000,000 11) 5200 ÷ 4.46 = __________ 1,200 12) 0.0052 x 0.4 x 107 = __________ .2 13) 0.099 x 8.8 = __________ .87 14) 0.0095 x 5.2 = __________ .049 15) 8000 ÷ 4.62 = __________ 2000 16) 0.6 x 0.8 = __________ .5 17) 2.84 x 0.66 = __________ 1.9 18) 0.5 x 0.09 = __________ .05 19) 8100 ÷ 34.84 = __________ 230 20) 8.24 x 6.9 x 8100 = __________ 460,000

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