80
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16,25,36 add to 77. They are the squares of consecutive numbers 4,5,6
Compatible numbers are numbers that are close in value to the actual numbers and easy to add, subtract, multiply, or divide mentally.So a logical compatible number for 77 would be 80.
77 is not the square of an integer. Rounded to five decimal places, its square root is equal to 8.7750.
76 + 77 + 78 three numbers in a row
Nothing can fall "between 77". 77 is one number; you need an interval for any numbers to fall BETWEEN.