1. ADDING OF
INTEGERS
BY: MS. ABELLA

2. MAGIC
ADDITION

3. PICK UP THREE
DIFFERENT
NUMBERS
BETWEEN 1 AND 9

4. EXAMPLE
257

5. WRITE THE THREE
NUMBERS DOWN NEXT
TO THE OTHER , LARGEST
FIRST AND SMALLEST
LAST.

6. EXAMPLE:
752

7. FORM A NEW THREE-DIGIT
NUMBER BY REVERSING THE
DIGITS AND WRITE THIS
NUMBER UNDERNEATH THE
FIRST NUMBER

8. EXAMPLE;
752
257

9. NOW, SUBTRACT THE
SMALLER THREE-DIGIT
NUMBER FROM THE
LARGER THREE-DIGIT
NUMBER

10. NOW, LET ME GUESS
THE SUM OF THIS 3-
DIGIT NUMBER…

11. IT’S 18!

12. WHY?

13. A tile represents +1
And a tile
represents -1

14. Recall and note that
when (+) charge and
(-) meets it will
explode.

15. EXAMPLE 1:Use algebra
tiles to model
=5
= -2

16. EXAMPLE 2: Use algebra
tiles to model the sum.
-5+(-2)
- = -7

17. The same charges
will repel to each
other

18. Example 3:
(-2) + (2)
+ =0

19. There 2 negative
charges and two
positive charges . These
will attract

20. Rules in adding Integers
• Like signs (+) + (+) or (-) + (-). Find the sum
of their absolute values, and use the sign
common to both integers
•Unlike signs : (+) + (-) or (-) + (+). Find the
difference of their absolute values, and use
the sign of the integer with greater absolute
value.

21. Example:
-4 + 5
/-4/ + /5/ = 5 – 4 Find the
=1 difference of their
absolute values
and simplify
Since 5 has the
greater value, the
sum is positive

22. Example:
Use a number line to add these integers.
5+2
0 2 4 6 8

23. Begin at 0. Move 5 places to the
right , then 2 places more. The
stopping place is 7.
Thus, the sum is 7

24. “The highest form of pure thought is in
mathematics”
-Plato

25. THANK
YOU!!!