for future reference

1. ADDITION &
SUBTRACTION
OF INTEGERS
Prepared by:
Cheryl M. Asia

3. Objectives:
 To add and subtract
integers
 Memorize the rule in
addition and subtraction of
integers,
 Enjoy participating in the
discussion.

4. A number line is a straight line with a "zero"
point in the middle, with positive and
negative numbers listed on either side of
zero and going on indefinitely.
 Absolute value describes the distance of
a number on the number line from 0
without considering which direction from
zero the number lies. It is denoted by two
bars ( I I ).

6. Algebra tiles

7. Add the following using algebra tiles:
1. 5 + (-7) =
2. (-4) + (-2) =
3. 9 + 12 =
4. 12 + (-3) =
5. 6 + 5 =

8. Subtraction of Integers
To subtract signed numbers, add its
additive inverse, for any real numbers
(x) – (-y)= x + (y)
(x) _ (+y)= x + (-y)
Examples:
a. 2- (-4) = ____
2 + 4 = 6
b. (-4) – (-9) = _____
(-4) + 9 = 5

9. RULES IN ADDITION OF INTEGERS
Row your Boat Tune…
SAME SIGN ADD AND KEEP
DIFFERENT SIGN SUBTRACT
COPY THE SIGN OF A HIGHER NUMBER
THEN IT WILL BE EXACT…
(repeat 3x)

10. Activity: ROLL TO WIN!
Materials:
die, coin, and score card
The goal of the game is to reach the score of 10 or
-10. Both players start at 0. Player A throw a die,
say 5 comes up, the same player flips a coin. If the
head comes up 5 is positive, if the tail comes up 5
is negative. Player A then writes the score on the
first box. Player A and B takes turns on throwing a
die and a coin. If the first throw, Player A gets the
score of 5 and the second throw a score of -6, his
score now is -1, since 5 + (-6) =-1, it will be written
on the second box.
In the event that both have filled the boxes in the
scorecard the score with the highest absolute
value wins the game.

11. Good job students!
Thank you for your cooperation!!!!