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vanessamartin
there is one significant figure as a significant figure is any number other than 0

if it was 120 then it would be 2

jodeelhyn
There is only one significant figure in 100. Remember the three rules that make a number significant:
1. Non-zero digits are ALWAYS significant
2. Any zeros between two SIGNIFICANT digits are significant as well.
3. A final zero or trailing zeros in the DECIMAL portion ONLY are significant.