Moderator's note: Thread moved to homework section. Thus no template. I have an exercise in which I have to calculate the Area from the following measurements: L = 22.1 ± 0.1 cm W = 7.3 ± 0.1 cm Of course, A = W * L = 161.33 but since I have a measurement with just 2 significant digits the results is limited to 2, A = 160 (or 1.6 x 102 cm). Now I apply error propagation: (σA)2=(σW)2(∂A/∂W)2+(σL)2(∂A/∂L)2 computing the terms, it gives σA = 2.327 cm Now I write my answer: 160 ± 2 cm My question is, can I have a error in a decimal place with no significant digits in that decimal place in my answer? Should it be 161 ± 2 cm?