Calculating with integers in the arithmetic house - Learn mathematics online with realmath.de

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The arithmetic house has a cellar, a first floor and a roof. Two numbers are on the first floor. In the roof is the sum of these two numbers, in the cellar their difference. Determine the missing numbers. Pay attention to the signs and arithmetic operations.

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Arithmetic house in ℤ

-level 1-

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Addition - Help
- Rule for same signs
((-3)) + ((-5)) = -8
((+3)) + ((+5)) = +8
Add the absolute values of the numbers.
The result gets the common sign.
- Rule for different signs
((-8)) + ((+5)) = -3
((-6)) + ((+9)) = +3
Subtract the absolute values of the numbers.
The result gets the sign of the larger absolute value.
Subtraction - Help
Integers can be subtracted by
adding the opposite number.
Examples:
((-3))-((+5)) = ((-3))+((-5)) = -8
((-3))-((-5)) = ((-3))+((+5)) = +2
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