In calculations involving multiplication and division, the answer's precision is limited by the number with the smallest number of significant digits.

For example 3.0 has two significant figures, 6.00 has three, the result of multiplication 3.0 x 6.00 = 18 has two significant figures. 18 has the same number of significant figures as the number with the smallest number of significant figures, which is 3.0 m.

Similarly, the result of division 6.00 ÷ 3.0 = 2.0 has two significant figures. 2.0 has the same number of significant figures as the number with the smallest number of significant figures, which is 3.0 m.