1
10
11
12
13
14
15
16
17
18
19
21
31
41
51
61
71
81
91
100
There are 21 "1s" between 1 and 100 including 1 and 100.
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312132 or 231213
1 x 10 x 10 x 10 x 9 = 9000 1 = it must be 2 10's = any digits 9 = any digit BUT zero
100 divided by 4 = 25. There are 25 4's in 100.
2.3 recurring
Do you have a number you want to round? Look at the 100's digit ( the second to the left of the decimal point). If it is 5 or more, add 1 to the thousands digit (the next one to the left). Now replace the tens and units digits with zeros (and drop any numbers after the decimal point).