1. Jenny answered 95% of her test correctly. If there were 60 items in the test, how many items did she answer correctly? How many mistakes did she make? *
2. 20% of the pupils in Mrs. Laureta’s class are absent. If she has 40 students in all, how many of them are absent?
3. Among the 1,400 students who attend school, 12% are left-handed. How many are left-handed? How many are right-handed?
.-.
2. 20% of the pupils in Mrs. Laureta’s class are absent. If she has 40 students in all, how many of them are absent?
3. Among the 1,400 students who attend school, 12% are left-handed. How many are left-handed? How many are right-handed?
.-.
Answers & Comments
Answer:
1. 100 - 95 = 5% mistake
60 × (5 ÷ 100)
60 × 0.05 = 3 mistakes
2. 40 × (20 ÷ 100)
40 × 0.2 = 8 students
3. 1400 × (12 ÷ 100)
1400 × 0.12 = 168 students are left-handed
1400 - 168 = 1232 students are right-handed