Addition: Like Signs
[-1] + [-3] =
-4
[+9] + [-4] =
+5
[-9] - [-8] =
-1
(-15) - (+2) =
-17
Which number's sign should be changed when subtracting integers?
The second number's sign
[-10] + [-6] =
-16
(+20) + (-4)
+16
[-4] - [-10] =
+6
[ +10 ] - [-10] =
+ 20
This happens to the first number when subtracting integers.
Keep it... Stays the same!
[+99] + [+12] =
+111
[-68] + [26] =
-42
[-42.2] - [-20.3] =
-21.9
[+24] - [-36] =
+60
______and ______ are opposite operations.
[-1.9] + [-9.8] =
-11.7
[-34.2] + [+43.5] = ___
+9.3
(-15) - (-34) =
+19
[+74.3] - [-52.9] =
+127.2
Which sign do you get when subtracting integers with similar/ like signs?
You keep the sign of the bigger number(+, -) / absolute value+.
[-31.2] + [-17.9] =
-49.1
[+58.2] + [-99.5] =
-41.3
[+11.7] - [+43.6] =
-31.9
[ -89.52] - [+37.8] =
-127.32
What rule helps us to subtract integers by changing the subtraction to addition?
Keep the first integer, change the operation sign, change the sign of the second integer.
Keep, Change, Change