Hal used the following procedure to find an estimate for StartRoot 82.5 EndRoot. Step 1: Since 9 squared = 81 and 10 squared = 100 and 81 < 82.5 < 100, StartRoot 82.5 EndRoot is between 9 and 10.

Step 2: Since 82.5 is closer to 81, square the tenths closer to 9.
9.0 squared = 81.00
9.1 squared = 82.81
9.2 squared = 84.64

Step 3: Since 81.00 < 82.5 < 82.81, square the hundredths closer to 9.1.
9.08 squared = 82.44
9.09 squared = 82.62

Step 4: Since 82.5 is closer to 82.62 than it is to 82.44, 9.09 is the best approximation for StartRoot 82.5 EndRoot.

In which step, if any, did Hal make an error?