Rules
Addition
Subtraction
Multiplication
Division
100
When you add two positives you (sometimes/always/never) get a positive sum.
What is always
100
(-4) + (+8) =
(+4)
100
(-1) - (-1)
What is 0
100
(-1) x (-25) =
What is (+25)
100
(-21) / (-7) =
What is (3)
200
When you add two negatives you (sometimes/always/never) get a positive sum.
What is never
200
(-12) + (-12) =
What is (-24)
200
(-20) - (+10)
What is (-30)
200
(-25) x (+2) =
What is (-50)
200
(-144) / (-12) =
What is (12)
300
When you multiply two integers with the same sign you (sometimes/always/never) get a negative product.
What is never
300
(-50) + (-75) =
What is (-125)
300
(-45) - (-15) =
What is (-30)
300
(+7) x (+9) =
What is (+63)
300
(-12) / (+2) =
What is (-6)
400
When you divide by two integers with different signs you (sometimes/always/never) get a negative product.
What is always
400
(-100) + (+25) =
What is (-75)
400
(-224) - (-25) =
What is (- 199)
400
(+9) x (-8) =
What is (-72)
400
(-56) / (+8) =
What is (-7)
500
You call both positive and negative whole numbers this.
What are integers
500
(-501) + (+500)
What is (-1)
500
(-5012) - (-28)
What is (-4984)
500
(-125) x (+5) =
What is (- 625)
500
(-625) / (+25) =
What is (-25)
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