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Reference:
Nivera, G. C. (2013), Grade 7 Mathematics: Pattern and Practicalities. Don Bosco Press Inc. Makati City, Philippines.
1. Grade 7 – Mathematics
Quarter I
SUBTRACTION OF INTEGERS
2. • determine the opposite of the given
integer; and
• apply the rules in subtracting
integers.
3. Rules in Adding Integers:
Fill in the blank.
Same signs, _________ and keep.
Different signs, ____________ ,
Keep the sign of bigger _________________.
ADDSUBTRACT
ABSOLUTE
VALUE
ADD
SUBTRACT
ABSOLUTE VALUE
5. SUBTRACTION OF INTEGERS
“adding the opposites”
a - b a - (-b)
a
KEEP – CHANGE - CHANGE
+ (-b)
KEEP
CHANGE
CHANGE
a + b
KEEP
CHANGE
CHANGE
- proceed to ADDITION rule
8. SUBTRACTION OF INTEGERS
-15 - ______ = 10
= -15 + (-10)-15 - 10
1. What number must be subtracted from -15 to
get 10?
= -25
(-25)
8 - ______ = -4
= 8 + 48 - (-4)
2. What number must be subtracted from 8 to
get -4?
= 12
12