A laboratory sample has a mass of 0.125 grams. A test uses 0.8 of the sample. Enter the mass used in grams.
Richtige Antwort
0.1
Erklärung
2.5 x 0.4: multiply 25 by 4 to get 100, then place two decimal places, giving 1.00 = 1 exactly. An answer of 10 would place the point one position too far right - it is ten times the correct result because one contributed decimal place was omitted.