Integers   »      

At the start of the page a star with integers was created.

Task:

Complete the number star.
Find the fourth summand, so that
the the sum of the four integers
is in the center of the star.

Pay attention to calculation advantages!

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Can you top 399 points?

Number star -Profi-
for addition of integers

 What is the missing summand?
        

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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.