Pre-Algebra Demystified

EXAMPLE

Subtractð
10 Þ
ð
3 Þ:

SOLUTION

ð
10 Þ
ð
3 Þ¼ð
10 Þþðþ 3 Þ ðopposite of
3 Þ
¼
7
Hence,ð
10 Þ
ð
3 Þ¼
7 :

EXAMPLE
Subtractð
8 Þ
ð
12 Þ:

SOLUTION

ð
8 Þ
ð
12 Þ¼ð
8 Þþðþ 12 Þ(opposite of
12 Þ
¼þ 4
Hence,ð
8 Þ
ð
12 Þ¼þ 4

PRACTICE
Subtract:

1. (þ10)
   (þ6)


2. ð
   3 Þ
   ð
   12 Þ


3. ð
   7 Þ
   (þ18)


4. (þ15)
   ð
   20 Þ


5. ð
   8 Þ
   ð
   13 Þ


6. (þ9)
   ð
   2 Þ


7. ð
   11 Þ
   ð
   11 Þ


8. (þ14)
   ð
   8 Þ


9. ð
   5 Þ
   (þ5)


10. 0
    ð
    3 Þ

ANSWERS

1. þ 4


2. þ 9


3. 
   25


4. þ 35


5. þ 5


6. þ 11


7. 0


8. þ 22


9. 
   10


10. þ 3

CHAPTER 2 Integers 25