1. 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.

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

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

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

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

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

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

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

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

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

11. Exercise
Solve.
74 − ( ) =
−37

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

13. Exercise
Solve.
(− ) − 39 + (−4) =

14. Exercise
Solve.
950 − (− ) =
1,565

15. C = K − 273
K = C + 273