How many 9s between 1 to 1000?

Answer 1

Every ten there is a nine in the ones place, therefore there are 100 nines in the ones place.

Every hundred there are 10 nines in the tens place, therefore add 10 * 10 nines. eg 90, 91, 92, 93, ... in the tens place

Every thousand there are 100 nines in the hundreds place, therefore add 100 nines.

Total is 300.

Answer 2

19

Answer 3

300