Integers   »      

The add & mult 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 product.

Determine the missing numbers.

Pay attention to the signs and arithmetic operations.

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Can you top 345 points?


Add & mult house in ℤhelp
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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.
  •   Multiplication - Help
    - same signs
    ((-3)) × ((-5)) = +15
    ((+3)) × ((+5)) = +15
    Multiply the absolute values of the numbers.
    The sign of the result is +.
    - different signs
    ((-8)) × ((+5)) = -40
    ((+6)) × ((-5)) = -30
    Multiply the absolute values of the numbers.
    The sign of the result is -.