All grade 4 students need to finish a math quiz on their computer at home in 2 weeks. In the quiz, there are 23 questions and they have up to 2 minutes to answer each question.
a. There are 3 Grade 4 classes and there are 21 students in each class. How many students need to finish the quiz?
b. During the first week, 16 students finished the test. 39 students finished the test during the second week. How many students failed to finish the tests in 2 weeks?
a) 3 * 21 = 63
b) 63 - 16 = 47
47 - 39 = 8
anonymous january 31 2021
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To find the answers to these questions, we can break down the problem and apply basic arithmetic operations.
a. The total number of students who need to finish the quiz is the sum of the students from each class. Since there are 3 classes and 21 students in each class, we can multiply these numbers:
Total number of students = 3 classes * 21 students/class
Calculating this, we get:
Total number of students = 63 students
Therefore, 63 students need to finish the quiz.
b. To calculate the number of students who failed to finish the test in 2 weeks, we need to subtract the number of students who finished the test from the total number of students.
First, let's find the number of students who completed the quiz:
Number of students who completed the quiz = Students completed in the first week + Students completed in the second week
Plugging in the given values, we have:
Number of students who completed the quiz = 16 students + 39 students
Calculating this, we get:
Number of students who completed the quiz = 55 students
To find the number of students who failed to finish the test, we subtract this value from the total number of students:
Number of students who failed to finish the test = Total number of students - Number of students who completed the quiz
Plugging in the known values, we have:
Number of students who failed to finish the test = 63 students - 55 students
Calculating this, we get:
Number of students who failed to finish the test = 8 students
Therefore, 8 students failed to finish the test in 2 weeks.