Using Counters

1
Using Counters

• Objective Use counters to solve the addition of
  negative and positive integers.

2
Adding positive integers
We already know that the addition of positive
integers results in a like sign answer. 5
3
Adding positive integers
We already know that the addition of positive
integers results in a like sign answer. 5

4
Adding positive integers
We already know that the addition of positive
integers results in a like sign answer. 5 4

5
Adding positive integers
We already know that the addition of positive
integers results in a like sign answer. 5 4


6
Adding positive integers
We already know that the addition of positive
integers results in a like sign answer. 5 4
9

9
7
Adding positive integers
We already know that the addition of positive
integers results in a like sign answer. This can
be applied to the addition of negative
integers. 5 4 9

9
8
Adding positive integers
We already know that the addition of positive
integers results in a like sign answer. This can
be applied to the addition of negative
integers. -5
9
Adding positive integers
We already know that the addition of positive
integers results in a like sign answer. This can
be applied to the addition of negative
integers. -5

10
Adding positive integers
We already know that the addition of positive
integers results in a like sign answer. This can
be applied to the addition of negative
integers. -5 (-4)

11
Adding positive integers
We already know that the addition of positive
integers results in a like sign answer. This can
be applied to the addition of negative
integers. -5 (-4)


12
Adding positive integers
We already know that the addition of positive
integers results in a like sign answer. This can
be applied to the addition of negative
integers. -5 (-4) -9

-9
13
Adding integers with different signs

• Rule Subtract the absolute values of the
  integers. The difference will have the same sign
  of the integer with the greatest absolute value.

14
Example
Find 4 5 The absolute value of negative four
is four. The absolute value of positive five is
five. The difference of their absolute values is
one. The largest absolute value is five so the
answer one get the sign of the five which is
positive. So, -4 5 1
15
Alternative MethodUse counters to add unlike
signed integers.
-4
16
Alternative MethodUse counters to add unlike
signed integers.
-4 5

17
Alternative MethodUse counters to add unlike
signed integers.
-4 5
A positive and a negative together become
neutral. When we put a negative with a positive,
they go away.

18
Alternative MethodUse counters to add unlike
signed integers.
-4 5
A positive and a negative together become
neutral. When we put a negative with a positive,
they go away.

19
Alternative MethodUse counters to add unlike
signed integers.
-4 5
A positive and a negative together become
neutral. When we put a negative with a positive,
they go away.

20
Alternative MethodUse counters to add unlike
signed integers.
-4 5
A positive and a negative together become
neutral. When we put a negative with a positive,
they go away.

21
Alternative MethodUse counters to add unlike
signed integers.
-4 5
A positive and a negative together become
neutral. When we put a negative with a positive,
they go away.

22
Alternative MethodUse counters to add unlike
signed integers.
-4 5
A positive and a negative together become
neutral. When we put a negative with a positive,
they go away.

23
Alternative MethodUse counters to add unlike
signed integers.
-4 5
A positive and a negative together become
neutral. When we put a negative with a positive,
they go away.

24
Alternative MethodUse counters to add unlike
signed integers.
-4 5
A positive and a negative together become
neutral. When we put a negative with a positive,
they go away.

25
Alternative MethodUse counters to add unlike
signed integers.
-4 5
A positive and a negative together become
neutral. When we put a negative with a positive,
they go away.
That leaves a positive one as our answer. It is
the same answer that we got using strictly math.