10 + 77 = 87
Mean = average; so (77+10)/2 = 43.5 = mean of 77 plus 10.
12 + 65 = 77 (this is in base 10, of course).
154
77 plus 76 plus 69 plus 56 is equal to 278.
77 over 10 = 77/10
76+77=153
77 + 89 = 166
77 + 1234 = 1,311
77 + 84 = 161
84 + 96 + 72 + 77 + 91 = 420
51 percent plus 77 percent = 128 percent 51% + 77% = 128%
9 + 77 + 865 − 800 + 567543 + 8,765,444,443,322,345,678,899,999,987,654,433,222,234,678,999,887,766,555 = 8,765,444,443,322,345,678,899,999,987,654,433,222,234,678,999,888,334,249