The number of significant figures in the number 80 is only 1.
When it comes to significant figures, 0 is not considered a significant figure if it comes after a number and is before a decimal point.
In other words, because 0 came after 8 in the number 80 and yet is before a decimal figure, the only significant figure in 80 is 8.
In conclusion, the number 80 has only one significant figure which is 8.
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