Hadley tried to evaluate 5\times4{,}0005×4,0005, times, 4, comma, 000 step by step. \phantom{=}\greend5\times\blued{4{, }000}=5×4,000empty space, start color greend, 5, end color greend, times, start color blued, 4, comma, 000, end color blued {\text{step } 1}step 1s, t, e, p, space, 1 =\greend5 \times \blued{4} \times \blued{1{,}000} =5×4×1,000equals, start color greend, 5, end color greend, times, start color blued, 4, end color blued, times, start color blued, 1, comma, 000, end color blued {\text{step } 2}step 2s, t, e, p, space, 2 = 20\times \blued{1{,}000} =20×1,000equals, 20, times, start color blued, 1, comma, 000, end color blued {\text{step } 3}step 3s, t, e, p, space, 3 =20{,}000=20,000equals, 20, comma, 000 find hadley's mistake.