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Use number line and add the following integers:
(a) 9 + (− 6)
(b) 5 + (− 11)
(c) (− 1) + (− 7)
(d) (− 5) + 10
(e) (− 1) + (− 2) + (− 3)
(f) (− 2) + 8 + (− 4)
Answer
Two important things to remember
When we add positive integer, we move to the right
When we add negative integer, we move to the right
a) 9 + (− 6)
We start with number 9 and move to left six steps and we reach the number 3
b) 5 + (− 11)
We start with number 5 and move to left 11 steps and we reach the number 6
c) (− 1) + (− 7)
We start with number 1 and move to left 7 steps and we reach the number 8
d) (− 5) + 10
We start with number 5 and move to right 10 steps and we reach the number 5
e) (− 1) + (− 2) + (− 3)
We start with number 1 and move to left 2 steps and we reach the number 3. Then again we move to left 3 steps and we reach finally 6
f) (− 2) + 8 + (− 4)
We start with number 2 and move to right 8 steps and we reach the number 6. Then again we move to left 4 steps and we reach finally 2
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