Round 758 to the nearest ten

Rounding off to ten is referring to the first number (1st number from right)

if it's >5, it + 1 to the tenth number (2nd number),

eg. 76 rounded off by ten = 80

if <5 then it reduces to 0.

eg. 34 rounded off by ten = 30

for your case, 758 rounded off to ten = 760