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] =
-11.8
[-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?
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 are the three steps when subtracting integers with like signs?
1. Subtract the numbers.
2. Change the sign of the second integer.
3. Copy the common sign.