Tania measured the growth of her plant each week. In the first week, the plant's height measured 4.92 decimeters. During the second week, Tania's plant grew 0.9 decimeters. How tall was Tania's plant at the end of the second week? Complete the description of the steps to solve the problem.

From rounding each number to the nearest whole number, an estimate of the sum is about decimeters. Then add 4.92 and 0.9. Write an equivalent decimal for 0.9 so the addends have the same number of decimal places. Add the hundredths, then the tenths. Regroup 10 tenths as 1 one, and add the ones. At the end of the second week, Tania's plant was decimeters tall.

The answer is close to the estimate so the answer is reasonable or not reasonable