Question

42. Rosa incorrectly calculates the product of 4.162 and 2.5 as shown.Line 1:4.162Line 2: X 2.5Line 3: 20810Line 4: 83240Line 5: 104.050What mistake did Rosa make in this calculation?cShe did not add Lines 3 and 4 correctly.She added an extra zero at the end of Line 4.She placed the decimal point in the wrong place in Line 5:She did not add the regrouped digits when multiplying to find theproduct in Line 3.

Answer 1

We want to know what was the error that Rosa make in this calculation. On this case, we multiply:

Where we put 4 decimal places as the first decimal number has 3 decimal digits, and the second one has 1.

On the calculation Rosa did, we see that she just put 3 decimal digits on his answer, and thus the mistake occurs because she placed the decimal point in the wrong place in Line 5.

The answer would be C.