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The last two zeros are insignificant, because zeros following a decimal have no effect. Therefore, there are 6 significant numbers in 0.0034500, those numbers being 0.00345.
There are more significant digits in this number than four. The leading zero before the decimal point is not deemed insignificant nor are any of the numbers proceeding it.In 1600.00 the proceeding two zeros after 1600 are insignificant. However, 1600.001, all numbers are significant.
If the decimal you resulted in was 23.0 (the rest of the zeros are considered insignificant), then the percentage would be calculated by moving the decimal point two places two the right. Therefore, the resulting percentage of 23.0 would be 2300%.
Billion has 9 zeros Trillion has 12 zeros Quadrillion has 15 zeros Quintillion has 18 zeros Sextillion has 21 zeros Septillion has 24 zeros Octillion has 27 zeros Nonillion has 30 zeros Decillion has 33 zeros Undecillion has 36 zeros Duodecillion has 39 zeros Tredecillion has 42 zeros Quattuordecillion has 45 zeros Quindecillion has 48 zeros Sexdecillion has 51 zeros Septendecillion has 54 zeros Octodecillion has 57 zeros Novemdecillion has 60 zeros Vigintillion has 63 zeros Googol has 100 zeros. Centillion has 303 zeros (except in Britain, where it has 600 zeros) Googolplex has a googol of zeros
crossing zeros is a completely differ thing to touching zeros