Relationships and Change - Week 41 Lesson 2: Fractions of Amounts
Lesson Objective: The students will be able to determine the fraction of a given amount (number).
Warm-Up:
- Find the equivalent fractions 3/5 = ?/15 and 20/25 = 4/?
- Simplify: 32/36 and 24/36
Step 1: Amount divided by the denominator.
Step 2: Multiply the answer by the numerator.
Examples:
Find 4/8 of 40
So if I want to find 4/8 of 40 the denominator is 8.
Step 1: 40 divided by 8 (denominator) (By doing this we have found ⅛)
Step 2: That answer is 5. Then multiply by 4 (numerator) by 5.
Step 3: Write the answer
A: 20
Find 4/5 of 35.
Step 1: I divide 35 by 5.
Step 2: That answer is 7. Multiply by 4 (numerator) by 7.
Step 3: Write the answer.
A:28
Word Problem examples:
There were 66 apples on the tree. John eats 2/3 of them. How many are left?
There are 60 people on the bus. 2/6 are children. How many adults are there?
Jason sleeps for ¾ of every 24 hours. How many hours is he awake for?
Jennifer eats 3/8 of the 32 biscuits in the tin. How many biscuits are left?
More practice in the class:
Book
Page 229
Questions 1 - 10
Extension: