A machine makes 4.25 metres of cable per cycle and runs for 0.6 of a cycle. Enter the number of metres made.

الشرح

4.25 x 0.6: multiply 425 by 6 to get 2550, then place three decimal places, giving 2.550 = 2.55. The wrong answer 25.5 comes from treating 0.6 as 6, which makes the product ten times too large.