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4 is a whole number and can never be a decimal.
It has 4. Every 0 after a decimal and after a significant digit is significant.
The significant figures for 0.054 are 2. In a decimal number, leading zeros are not considered significant. Therefore, the significant figures in 0.054 are the digits 5 and 4. The zeros after the decimal point are considered significant.
With a decimal point, all digits for that number are counted. Then, we have 4 significant figures.
The number 13.2 have 3 signification figures and a least significant decimal of-1. The new formation should look like (13.20) and have 4 significant figures and a least significant figure of decimal -2.