Computation review
Presentation
•
Mathematics
•
5th - 12th Grade
•
Easy
Uel Roberts
Used 42+ times
FREE Resource
24 Slides • 22 Questions
1
Computation Review
by Uel Roberts - Johnson
2
Poll
Dream vacation
3
Learning Objectives
By the end of this session, students should be able to:
Accurately evaluate 3 fractions involving mixed operations.
Express 3 numbers in their equivalent percentage, fraction and decimal forms.
Solve 2 worded problems involving percentages.
Solve 2 worded problems involving ratios and proportion.
4
5
Multiple Choice
Say whether proper or improper . . .
25
Proper
Improper
6
Multiple Choice
Say whether proper or improper . . .
116
Proper
I
7
Multiple Choice
State the name for the following:
1041
Proper Fraction
Improper Fraction
Mixed Number
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Multiple Select
Which of the following fractions are equivalent?
2/3 = 10/15
7/9 = 14/16
3/7 = 21/21
6/11 = 24/44
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Write your own example . . .
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The LCM
Means Lowest Common Multiple
Is the smallest number that all of the numbers in a group can go into without leaving a remainder.
Cannot be smaller than the largest number in the group of numbers.
Ex. 5, 10, 15
The LCM cannot be smaller than 15. The LCM is 30.
Ex. 4, 12, 20
The LCM cannot be smaller than 20. The LCM is 60.
11
Multiple Choice
True or False: The LCM is the smallest number that all the numbers in a group can go into without leaving a remainder.
True
False
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Multiple Choice
The LCM cannot be __________ the largest number in the group.
larger than
smaller than
equivalent to
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Multiple Choice
Determine the LCM of 6, 4 and 12
12
6
4
2
14
Write the LCM of 10, 15, 20
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Multiple Choice
To convert from a mixed number to an improper fraction, you ____________________.
Add the numerator to the whole number and then divide by the denominator.
Multiply the whole number by the numerator and place the answer over the denominator.
Multiply the denominator by the whole number, add this number to the numerator and place it over the denominator.
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Multiple Select
Tick the correct equations:
5 1/2 = 6/2
3 4/7 = 25/7
2 1/4 = 8/4
7 2/3 = 23/3
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18
Multiple Choice
To convert from an improper fraction to a mixed number you ___________.
Divide the numerator by the denominator, the answer becomes the whole number and put the remainder over the denominator.
Make the numerator the whole number, subtract the denominator from the numerator and write the answer over the denominator.
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20
Multiple Select
A Fraction ___________________________________.
Is part of a whole
Is a ratio of two numbers
Should be simplified in it's lowest terms
Has a numerator and a denominator
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Multiple Choice
How do you add / subtract fractions?
Add the numerators and then the denominators
Make the denominators the same (using the LCM) and then add the numerators
Make equivalent fractions and then add / subtract
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23
Multiple Choice
How do you multiply fractions?
Find the LCM and then multiply the numerators and denominators
Simplify where possible and then multiply the numerators and denominators
Flip the second fraction and then multiply the numerators and denominators
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Write your own example . . .
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Multiple Choice
How do you divide fractions?
Find the LCM and then multiply the numerators and denominators
Change the division sign to multiplication and then flip the fraction before (to the left of) the division sign
Change the division sign to multiplication and then flip the fraction after (to the right of) the division sign
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Multiple Choice
To evaluate fractions involving mixed operations, you should:
Perform the operations in the order that they appear
Add / Subtract first and then Multiply / Divide
Apply BODMAS
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Poll
BODMAS means
Bored
Of
Doing
Maths
At
School
Brackets
Of
Division
Multiplication
Addition
Subtraction
I don't know
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Mixed Operations Involving Fractions
BODMAS
Text book - page 14, problem 19
Practice pg 15 # 1, 3, 5 - 7, 10 and 12
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Question 1
31
Question 3
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Question 7
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Poll
How was that?
Very Good
Good
Not Good
Terrible
34
Percentages
A fraction that is out of 100
Literally means per 100
Used to give a common standard
Very common in commercial life and in engineering
Also used for sale reductions, interest rates, pay rises, exams and VAT.
Symbol: %
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Multiple Choice
How do you convert a fraction to a percentage?
Divide by 100
Multiply by 100
Add that number that will give you 100 to the denominator, to both the numerator and denominator
36
Multiple Choice
43 expressed as a percentage is ..........................
20%
30%
40%
75%
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Let's see how it works
Text book Page 36 problems 1 - 7
Practice Page 37, Ex 21 # 15
Problems 15, 18 and 19
Ex. 22 # 9, Ex. 23 # 2 and 5
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Ex. 22 #9
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Ex. 23 # 2
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Ex. 23 # 5
41
Poll
How was that?
Very Good
Good
Not so Good
Terrible
42
Ratios
Compares amounts
Are generally shown as numbers separated by a colon
Are expressed in their simplest form
43
Let's see how it works....
Page 44 problems 1, 3 and 4
Practice ex. 24 # 1 and 6
44
Ex. 24 # 1
Total no. of paperclips = 333
No. of defective = 9
So, no. of non - defective = 333 - 9 = 324
Ratio of non - defective to defective = 324:9 = 36:1
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Ex. 24 # 6
46
Poll
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Computation Review
by Uel Roberts - Johnson
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