Subtraction Subtracting 2 from 3 and adding the opposite of 2, or −2, to 3 give the same results. Thus, subtraction can be defined in terms of addition.

Subtraction Subtraction is adding the opposite. In symbols, a − b = a + (−b) for any real numbers a and b.

Parts of a Subtraction Problem Minuend 9 Subtrahend − 4 Difference 5

Example 1 Rewrite the following subtraction problems as addition problems. a. 9 − (−7) 9 + 7

Example 1 Rewrite the following subtraction problems as addition problems. b. −5 − 9 −5 + (–9)

Example 1 Rewrite the following subtraction problems as addition problems. c. 8 − 15 8 + (–15)

Example 2 Subtract 9 from −7. −7 − 9 −7 + (−9) = −16

Example 3 Subtract −5 from 8. 8 − (−5) 8 + 5 = 13

Exercise Solve. 340 − (−147) − 809 = −322

Exercise Solve. −81 + (36 − 110) = −155

Exercise Solve. 74 − (99 + 12) = −37

Exercise Solve. 88 + (−14) + (15 − 21) = 68

Exercise Solve. (−27 + 70) − 39 + (−4) =

Exercise Solve. 950 − (−661 + 46) = 1,565

C = K − 273 K = C + 273