Peter's math test had 20 questions. He got his paper back from his teachers and he made an 80%. How many questions did he answer incorrectly
0.2 * 20 = ______
To find the number of questions Peter answered incorrectly, we need to calculate the number of questions he got wrong.
To do this, we multiply his test score (80%) by the total number of questions (20):
80% * 20 = (80/100) * 20 = 16
Therefore, Peter answered 16 questions incorrectly.