Transcript 8 - TeacherWeb

Comparing Fractions
6/9
Mrs. Wolfe, grade 5
What is a fraction?
A fraction is a number that
represents PART of a whole
1
This whole pizza has
8 slices
8
3
7
4
6
Each slice represents 1/8 of the pizza
2
5
Comparing Fractions
With Common Denominators
Which fraction is larger?
When two fractions have the same denominators,
at the numerator
to decide which one is larger.
3/8 or 6/8
When the denominators are the same, the fraction with the greater numerator is larger.
at the shaded part of the pizza
Which fraction is larger – 3/8
3/8
or
6/8?
6/8
When the denominators are the same, the fraction with the greater numerator is
larger.
Which fraction is larger?
8/12 or 5/12
0
9/15 or 3/15
2/4 or 3/4
1/7 or 6/7
0
0
0
1
1
1
1
Can you figure out which fraction is larger?
6/13 or 3/13
6/13
4/10 or 8/10
8/10
12/14 or 13/14
13/14
Comparing Fractions with
The Same Numerator
Which fraction is larger?
When two fractions have different denominators, but both of the numerators are the same
at the denominator.
1
1
or
2
8
Which would be larger- 1/2 a pizza or 1/8 of a pizza?
Which fraction is larger – 1/8 or 1/2 ?
1
1
4
=
8
2
8
When two fractions have different denominators and the same numerator, then the fraction
with the smallest denominator is the largest fraction.
0
1
0
1
Which fraction is larger – 1/2 or 1/8 ?
Practice With Fractions That Have The Same
Numerator
Which fraction is larger?
1/8 or 1/7
1/7
3/4 or 3/12
3/4
1/2 or 1/3
1/2
5/9 or 5/6
5/6
What if both the denominators and the numerators
are different? How can we tell which fraction is
larger?
Comparing Fractions
With Different Denominators
Which fraction is larger?
When two fractions have both different denominators and different numerators, you need
to find a common denominator
1
6
or
2
8
How Do We Find a Common Denominator?
1
X
2
X
4
4
=
1
6
2
8
4
Which fraction is larger –
8
4/8 or 6/8?
Find Common Denominators for These Pairs of
Fractions
4 3
12 6
4
12
3
6
X
X
2 6
=
2 12
Which fraction is larger- 4/12 or 6/12 ?
Which fraction is larger- 4/12 or 3/6 ?
2
3
7
9
7
9
Which fraction is larger- 7/9 or 6/9 ?
Which fraction is larger- 7/9 or 2/3 ?
3/6
2
3
X
X
3= 6
3 9
7/9
Mixed Review
Which fraction is larger?
4/6 or 2/6 ?
4/6
2/8 or 4/16 ?
equal
2/8 or 2/10 ?
2/8
2/3 or 9/21 ?
2/3
3/12 or 4/6 ?
4/6
7/10 or 3/10 ?
7/10
6/9 or 3/9 ?
6/9
8/12 or 8/9 ?
8/9
5/7 or 5/8 ?
5/7
3/6 or 2/6 ?
3/6