Problem

Nora tried to evaluate an expression step by step.
1539÷3=(1500÷3)+(30÷3)+(9÷3)Step 1=500+10+3Step 2=513Step 3\qquad\begin{aligned} &1539 \div 3\\\\ \\ =&(1500 \div 3) + (30 \div3) + (9 \div3)&\greenD{\text{Step } 1}\\\\ \\ =&500 + 10 + 3&\blueD{\text{Step } 2}\\\\ \\ =&513&\purpleC{\text{Step } 3} \\\\ \end{aligned}
Find Nora's mistake.
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