Answer:
12.489996 = 12.49 (2 decimal places) / 12.5 (3 significant figures)
Explanation:
You can use the calculator or the estimation method.
Estimation method:
156 lies between 12^2 and 13^2 - 144 and 169 respectively.
(144 + 169)÷2 gives the central number which is 156.5.
156 is quite close to 156.5 and to estimate, an answer of around 12.49 can be found.
Thus, an answer of 12.5 can be estimated.