Question

Bill wrote all the numbers from 1 to 1000. how many digits did he write down?

Answer 1

• 2890 digits

--------------------------

One - digit numbers

• 1 to 9 ⇒ 9 numbers

Two - digit numbers

• 10 to 99 ⇒ 100 - 10 = 90

Three - digit numbers

• 100 to 999 ⇒ 1000 - 100 = 900

Four - digit number

• 1000 ⇒ 1

Number of digits

• 1*9 + 2*90 + 3*900 + 1 = 2890