Question

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.

Answer 1

Hardley didn't make any mistake

Explanation:

Given

Step 1: 5×4×1,000

Step 2: 20 * 1,000

Step 3: 20,000

Required

Find Hadley's mistake.

From the highlighted steps above, it is evident that Hardley did not make any mistake when evaluating the given expression.

At step 1, he expanded 4,000 to 4 * 1,000

Step 1:

5×4×1,000

At step 2, he multiplied 5 by 4 which gives 20

Step 2

20 * 1,000

At the last step, which is step 3, he multiplied 20 by 1,000 which gives 20,000 and this is the result of the given expression 5 * 4,000

Step 3

20,000