Least Common Denominator It is the lowest number that is a multiple of two numbers. Example: 12 is the Least Common Denominator for 3 and 4.
What does LCD stand for?
100
Greatest Common Factor. List all of the factors of two numbers and find the largest number that is in both sets. That is the GCF?
What does GCF stand for?
100
$5
If a shirt costs $10, but is 1/2 off, how much does it now cost?
200
What is the denominator?
In order to compare fractions, it is easier if these are the same.
200
7/10
What part of a pizza would you rather have- 3/5 or 7/10? Assume you like the pizza and you're as hungry as a horse after a 10 mile ride.
200
20
What is the LCD for 1/4 and 1/5?
200
No. Example: 3 has the factors of 1 and 3. 14 has the factors of 1, 2, 7 and 14. They have no factors in common.
Is there a GCF (other than 1) for any two numbers?
200
The are the inverse. "1/2" divides something in half and "twice as much" doubles it.
What is the relationship between "1/2" and "twice as much?"
300
The fraction with the smallest denominator. Example: 1/2 is much larger than 1/100.
If the numerators are all 1, how do you tell which fraction is larger?
300
2/3
Which is larger- 2/3 or 7/12?
300
Yes! Often.
Can the LCD ever be larger than both denominators?
300
9
What is the GCF of 18 and 27?
300
12,000...approximately
If Coeur d' Alene has a population of over 35,000 and 1/3 of them can juggle, about how many are able to juggle?
400
They are equal.
Who is larger- .5 or 1/2?
400
19/20
Which is larger- 19/20 or 19/21?
400
9
What is the LCD for 8/9 and 1/9?
400
3
What is the GCF of 3 and 57?
400
21/30
If it rained 21 out of 30 days in April, how could you express this as a fraction?
500
4/5. The lowest common denominator is 20, so 3/4=15/20 and 4/5=16/20.
Who is larger- 3/4 or 4/5?
500
7/8
Which is larger- 6/7 or 7/8?
500
30
What is the LCD for 4/15 and 7/30?
500
7
What is the GCF of 21, 42 and 70?
500
7 1/2 hours
Before Emily left, there were 60 5th graders at Sorensen. If half of them read for at least 30 minutes tonight, how many hours of reading would that be?