Question

how many times the number 1 occurs while writing the numbers from 1 to 999​

Answer 1

Answer:

The digit “1” occurs in the sequence “1 to 100” a total of 21 times.

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Answer 2

The number 1 occurs 300 times while writing the numbers from 1 to 999.

Step-by-step explanation:

We have to calculate how many times the digit 1 occurs.

From 1 to 99 each number (1-9) repeats by 20 times and 0 occurs 9 times.

From     To                Number of times digit 1 occurs

1             99                             20

100        199                            120          [100 more 1]

200       299                            20

300       399                             20

400       499                             20

500       599                             20

600       699                             20

700        799                            20

800        899                            20

900        999                            20

Total                                       300

The number 1 occurs 300 times while writing the numbers from 1 to 999.