math
posted by May .
20.46 * 4 = 81.86
Round the answer to 1 decimal place what is the answer?
My answer is 81.8 if not please tell me why and how?

81.9
the six rounds up. 
When I multiply 20.46 by 4 I get 81.84  so your answer is right. Rounded to one decimal place, it's 81.8