Question

quantos algarismos escrevemos para representar todos os números de 35 ate 186

Answer 1

de 35 a 99 :
35,36,37,38,39 = 5
40,41,42,43,44,45,46,47,48,49 = 10
50,51,52,53,54,55,56,57,58,59 = 10
60,61,62,63,64,65,66,67,68,69 = 10
70,71,72,73,74,75,76,77,78,79 = 10
80,81,82,83,84,85,86,87,88,89 = 10
90,91,92,93,94,95,96,97,98,99 = 10
 65 números com 2 algarismos = 65 . 2 = 130 algarismos
100,101,102,103,104,105,106,107,108,109 = 10
110,111,112,113,114,115,116,117,118,119 = 10
120,121,122,123,124,125,126,127,128,129 = 10
130,131,132,133,134,135,136,137,138,139 = 10
140,141,142,143,144,145,146,147,148,149 = 10
150,151,152,153,154,155,156,157,158,159 = 10
160,161,162,163,164,165,166,167,168,169 = 10
170,171,172,173,174,175,176,177,178,179 = 10
180,181,182,183,184,185,186 = 7
 87 números de  3 algarismos = 87 . 3 = 261
261 + 130 = 391 algarismos.