Question

how many significant digits does this number have? -3.040 1 3 5 4

Explanation:

Step1: Recall significant - digit rules

Non - zero digits are always significant. So 3, 4 are significant.

Step2: Consider zeros

Zeros between non - zero digits are significant (the 0 between 3 and 4 is significant). Trailing zeros in a number with a decimal point are significant (the 0 after 4 is significant). The negative sign does not affect the number of significant digits.

Answer:

4