Calvin bought 20 pencils at 0.45 each how many change did he get from a 10 dollar bill

To get the answer, multiple 20 by 0.45 = $9 than subtract 9$ from $10 which equals $1.

1 dollar

Step-by-step explanation:

This is simple you multiply 20 by how much money

20 x. 45 = 9 then we will take how much money you SPENT and minus it from what you gave the cashier

10 - 9 = 1 you got 1 dollar in change