What is one less than 277?
277 is a three-digit number. The two digit is worth two 100s,
this seven digit is worth seven 10s, and this seven is worth seven ones. We need to find one less than this
number, so we just need to take away a one. If we have seven ones and we take
one away, there will be six ones. The ones digit has decreased by
one. One less than 277 is 276.