Fractional Parts of a Set Lesson 9-4 Obective I
Description: Fractional Parts of a Set Lesson 9-4 Obective I can find a fractional part of a set. Vocabulary Unit Fraction A fraction where the top number (the numerator) is 1. You have learned how to write a faction to describe part of a set. Today
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slide2. Fractional Parts of a Set Lesson 9-4<br>
slide3. Obective I can find a fractional part of a set.<br>
slide4. Vocabulary Unit Fraction
A fraction where the top number (the "numerator") is 1.<br>
slide5. You have learned how to write a faction to describe part of a set. Today we are going to learn how to find how many items there are in a fractional part of a set.
When have you ever divided a set of items in halves, fourths, or in another fraction?
Sharing snacks, papers, or crayons.<br>
slide6. Pose the Problem Darren used ¼ of a carton of eggs to make breakfast. A carton has 12 eggs. How many eggs did he use? Use counters to solve.
How many equal parts does the fraction represent?
What does the numerator tell you?<br>
slide7. Expand How many counters should be in each part?
Why?
3, you divide 12 into 4 equal parts
How many eggs did Darren use?
3
What is ¼ of 12?
3
How did you know to divide 21 counters into 4 equal parts?
The denominator of ¼ is 4<br>
slide8. Unit Fraction Remember that the fraction is an example of a unit fraction. A unit fraction is a fraction with 1 as a numerator. What do you think the word “unit” means?<br>
slide9. Vocabulary A unit fraction is a fraction with a 1 as the numerator.
Unit means one (1)<br>
slide10. Find ½ of 6 What does the denominator in a fraction tell you?
The number of equal parts
What is the denominator in the problem?
2
How many equal parts should you make?
2
What does the numerator tell you?
The number of equal parts being used
How many of the equal parts should you use?
1<br>
slide11. Find ½ of 6<br>
slide12. Find 1/3 of 15 balls<br>
slide13. Find 1/3 of 21 apples<br>
slide14. Summer is ¼ of the entire year. How many months does summer last?
(Think of the hidden question – how many months are in an entire year?)<br>
slide15. Writing to Explain Marsha said she drew a picture to find
Of 16 walnuts. Explain why she is not correct. Then draw a picture to show of 16 walnuts. Explain what the numerator and denominator mean for of 16 walnuts.<br>
slide16. Writing to Explain Rubric<br>
slide17. 1 Point - Weak Marsha is not right because she put 8 in each group.
(I gave a reason why the drawing is wrong, but I don’t have a correct drawing or an explanation of the meaning of the numerator and denominator.)<br>
slide18. 2 Points Marsha’s picture does not show of 16.
(I explained why the drawing is incorrect and I drew a correct picture, but I did not give a full explanation for the meaning of the numerator and denominator.)<br>
slide19. 3 Points The picture does not show of 16 because it shows only 2 equal parts. You need to put 16 into 8 equal parts.
has a denominator of 8. That means you need to put 16 into 8 equal parts. The numerator is 1. So, find how many walnuts are in 1 equal part. This is 2 walnuts.<br>
slide3. Obective I can find a fractional part of a set.<br>
slide4. Vocabulary Unit Fraction
A fraction where the top number (the "numerator") is 1.<br>
slide5. You have learned how to write a faction to describe part of a set. Today we are going to learn how to find how many items there are in a fractional part of a set.
When have you ever divided a set of items in halves, fourths, or in another fraction?
Sharing snacks, papers, or crayons.<br>
slide6. Pose the Problem Darren used ¼ of a carton of eggs to make breakfast. A carton has 12 eggs. How many eggs did he use? Use counters to solve.
How many equal parts does the fraction represent?
What does the numerator tell you?<br>
slide7. Expand How many counters should be in each part?
Why?
3, you divide 12 into 4 equal parts
How many eggs did Darren use?
3
What is ¼ of 12?
3
How did you know to divide 21 counters into 4 equal parts?
The denominator of ¼ is 4<br>
slide8. Unit Fraction Remember that the fraction is an example of a unit fraction. A unit fraction is a fraction with 1 as a numerator. What do you think the word “unit” means?<br>
slide9. Vocabulary A unit fraction is a fraction with a 1 as the numerator.
Unit means one (1)<br>
slide10. Find ½ of 6 What does the denominator in a fraction tell you?
The number of equal parts
What is the denominator in the problem?
2
How many equal parts should you make?
2
What does the numerator tell you?
The number of equal parts being used
How many of the equal parts should you use?
1<br>
slide11. Find ½ of 6<br>
slide12. Find 1/3 of 15 balls<br>
slide13. Find 1/3 of 21 apples<br>
slide14. Summer is ¼ of the entire year. How many months does summer last?
(Think of the hidden question – how many months are in an entire year?)<br>
slide15. Writing to Explain Marsha said she drew a picture to find
Of 16 walnuts. Explain why she is not correct. Then draw a picture to show of 16 walnuts. Explain what the numerator and denominator mean for of 16 walnuts.<br>
slide16. Writing to Explain Rubric<br>
slide17. 1 Point - Weak Marsha is not right because she put 8 in each group.
(I gave a reason why the drawing is wrong, but I don’t have a correct drawing or an explanation of the meaning of the numerator and denominator.)<br>
slide18. 2 Points Marsha’s picture does not show of 16.
(I explained why the drawing is incorrect and I drew a correct picture, but I did not give a full explanation for the meaning of the numerator and denominator.)<br>
slide19. 3 Points The picture does not show of 16 because it shows only 2 equal parts. You need to put 16 into 8 equal parts.
has a denominator of 8. That means you need to put 16 into 8 equal parts. The numerator is 1. So, find how many walnuts are in 1 equal part. This is 2 walnuts.<br>