REVISION
Real Numbers
pg. 1
i
integer numbers = whole numbers + negative numbers.
+2 read as (positive 2) = 2
-2 read as (negative 2) = -2
Exercise
pg. 2
Note: 1- Zero is greater than any negative number.
2- Zero is less than any positive number.
_____________________________________________
pg. 3
5.A clothing store held a sale for one day. A t-shirt that
originally cost $15 was sold for $12. How much did the
customer saved?
pg. 4
s------------------------s
means same sign -----------sum
ex: -5+(-4) = -9
Same sign both of them (negative) so
the answer will be negative and add the
two numbers
5+4=9 same sign positive and add 5, 4
so the answer positive 9.
Note: 1- If you don’t write any sign in front
of the number so it means the
number is positive +6 = 6
2- MINUS negative number
Ex:- 7- -3= seven minus negative 3
-(-) -------------------------- +
pg. 5
7+3= 10
____________________________________________
D------------------------------------------------D
Different sign --------------------- difference
Ex:8+ -10 =
- (10-8) =
-2
1) put your hands on the signs.
2) which number is bigger 8 or10
of Course 10
3) put the sign of the bigger (greater)
number .
4) subtract the two numbers .
pg. 6
pg. 7
____________________________________________
Note: Absolute value always positive number because it
represents distance.
Distance always equal positive number
pg. 8