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How can u come up with a -54 by combining numbers that 84 is divisible by?

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2 Answers

Find the prime factorization for 84. Start by dividing by 2 since 84 is an even number.  2x42=84, next 2x6x7=84, next 2x2x3x7=84.  You have now found all the prime factors of 84.  Look at some multiples of 2, 3, or 7 to find numbers that add up to -54.     ans. -12 + -42 = -54 

                  ans. -12 + -28 + -14 = -54

(Make sure that any numbers you choose that add up to -54, have to also be divisible by 2, 3, or 7.)

                                                        

Write out the numbers 84 is divisible by. Try adding two together to get a number close to 54. Can you use any of the small numbers to add/subtract to get exactly -54?

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