Using Technology We can use a calculator to help us fi nd the sum of large signed numbers. To fi nd the value of 38 94 (548), we enter 3 8 9 4 5 4 8 or () 3 8 9 4 () 5 4 8 ENTER into the calculator. The display screen will show 492 as the result. 10.2 Exercises Do the exercises, and check your work. Objective 1: Add Signed Numbers Using a Number Line Add using a number line. 0 1 2 3 4 5 6 7 8 9 10 1) 8 (5) 2) 10 (3) 3) 6 9 2827262524 232221 0 1 2 3 4 2524 232221 0 1 2 3 4 5 4) 5 6 5) 5 (9) 6) 2 (3) 7) 3 1 8) 7 4 2827262524 232221 0 1 2 3 4 27262524 232221 0 1 2 3 9) 1 (2) 10) 2 (5) 11) 1 (5) 12) 3 (3) 13) Explain, in your own words, how to add a positive number and a negative number on a number line. 14) Explain, in your own words, how to add two negative numbers on a number line. Objective 2: Add Two Negative Numbers 15) Is the sum of two negative numbers always, sometimes, or never negative? 16) Explain, in your own words, how to add two negative numbers. Add. 17) 8 (3) 18) 5 (7) 19) 53 (45) 20) 47 (32) 21) 1 2 a 3 4 b 22) 7 4 a 5 6 b 23) 7 5 a 3 10 b 24) 5 2 a 1 8 b 25) 2.5 (5.9) 26) 1.4 (3.5) 27) 287.6 (108.3) 28) 543.8 (211.6) 29) 4 (13) (15) 30) 11 (10) (8) 31) 22 (67) (36) 32) 49 (33) (51) Objective 3: Add Numbers with Different Signs 33) Explain, in your own words, how to add two numbers with different signs. 34) Is the sum of a negative number and a positive number always, sometimes, or never negative? Add. 35) 9 6 36) 6 1 37) 3 11 38) 7 9 39) 10 (4) 40) 12 (8) 41) 2 (13) 42) 5 (18) 43) 62 47 44) 87 61 45) 135 328 46) 267 351 47) 546 (795) 48) 457 (603) 49) 24.6 (17.3) 50) 3.8 (31.2) 51) 16.7 (19.058) 52) 31.4 (24.027) 53) 3 8 1 4 54) 7 3 5 12 x. www.mhhe.com/messersmith SECTION 10.2 Adding Signed Numbers 731
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