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The only proper factors of 77 are 7 and 11. 11 isn't a factor of 259 but 7 is, so the answer is 7.
factor out both numbers until only prime numbers are left. 133=7*19 259=37*7 you would multiply together all the common factors, which in this case is just 7, to get the greatest common factor of 7
To write 259 TENS as a decimal, you would first recognize that each "TEN" represents a factor of 10. Therefore, 259 TENS can be represented as 259 x 10. Multiplying 259 by 10 gives you 2590. Therefore, 259 TENS written as a decimal is 2590.
713 + 259 = 259 + x972 = 259 + x713 = x
2592 = 259 x 259 = 67081