In a ninth grade class, there are 28 students, of whom are female.
How many females are in the class?
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In a ninth grade class, there are 28 students, of whom are female.
How many females are in the class?
Let's write the following exercise, we'll multiply the fraction by the number of students:
Let's multiply the numerator by 28:
Let's solve the exercise in the numerator, we'll break down 28 into a smaller multiplication exercise:
Let's reduce the 7 in the numerator and denominator of the fraction and we'll get:
Write the fraction shown in the picture, in words:
When we say "3/7 of the students", the word "of" means multiplication! We're finding what portion 3/7 represents out of the total 28 students.
Yes! , so 0.429 × 28 ≈ 12. But working with the fraction directly is more precise and often easier.
Look for common factors between the numerator and any whole numbers. Here, 28 = 7 × 4, so the 7s cancel out, making the calculation much simpler!
In real-world problems like counting students, check your work! You can't have a fraction of a person. If you get a decimal, you may have made an error or the problem might need rounding.
Two ways: 1) 12 ÷ 28 = 3/7 ✓ 2) If 12 are female, then 16 are male, and 12 + 16 = 28 total students ✓
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