Question

Calvin bought 20 pencils at $0.45 each. How much change did he get from a $10 bill?

Answer 1

Calvin got $1 back because 0.45 cents times 20 pencils would be 9 ($9 dollars). Since he used a $10 bill, 10-9=1

Answer 2

He got $1 back in change 
0.45 x 20 = 9
10 - 9 = 1