1. Review:
Compare fractions 7 7 5 4 ＜ ＜ 12 7 8 7 1 6 1 ＜ ＜ 1 10 7 9 5 5 8 8 ＜ ＜ 7 11 9 12 1 2 = 2 4

2. Review:
Let us sum up
unit fraction
same doneminator
same numerator

3. In unit fractions, if the denomina tor is bigger, then the value of
Conclusion:Unit fractions
In unit fractions, if the denomina
tor is bigger, then the value of
the unit fraction is smaller. 　 1 _ 1
1　　　　　　　　　　 — 4 —— —— 8 8 4

4. Compare the value of the fraction with
Conclusion:
fractions with
same denominator
Compare the value of the fraction with
the same denominator. The fraction with
the greater numerator is larger.

5. The fraction with the smaller denominator is greater.
Conclusion
Compare the value of the fractions
with same numerator.
The fraction with the smaller denominator is greater.

6. why Reasearch: not same numerator what about these fractions
not same denominator
not same numerator

7. Fraction Wall = = = = =

8. Draw figures ×2 1 2 4 = 8 = = 8 16 2 4 ×2
The denominator and numerator
expand the same multiple

9. = = Draw figures ÷2 2 8 4 3 12 6 ÷2 The denominator and numerator
reduce the same multiple

10. fraction won't change. If the denominator and numerator expand
Conclusion
Compare the value of the fractions
with different denominator and numerator.
If the denominator and numerator expand
or reduce the same multiple at same
time ( except 0),the value of the
fraction won't change.

11. Exercise 1
( ) 6 4 2 = = 4
( ) 8 12 9 6
( ) 3
( ) = = 4 8 12 6
( ) 4
( ) 1 2 = = =
( ) 30 5
( ) 20 10

12. Conclusion 20 20 ＜ 24 25 5 4 ＜ 6 5 25 24 ＜ 30 30
You should use the laws to make the numerator or denominator same to compare

13. Exercise 2 4 2 2 ＜ = 5 6 3 11 5 ×2 ＜ 3 2 ＜ 12 6 ×2 3 4 3 4 8 ÷2 9 ＜ ＜ 4 8 12 ÷2 12

14. Exercise 3 =（ ） =（ ） =（ ） =（ ） =（ ） 3 1 1 3 2 2 6 6 9 3 4 2 6 6 3 9
According to the
line segement chart
Exercise 3 3 1 1 3 2
=（ ）
=（ ）
=（ ） 2 6 6 9 3 4 2 6
=（ ）
=（ ） 6 3 9

15. challenge 1
Fill in the right fractions ＞ 14 13 3 3
＞（ ）
＞（ ） 4 20 20 5 15 12 20 20 45 36 60 60

16. 1 2 4 = = 2 4 8 2×2=1×4 2×8=4×4 1×8=2×4 cross multiplication
challenge 2
Can you find the
regular pattern 1 2 4 = = 2 4 8
2×2=1×4
cross multiplication
2×8=4×4
can you find
another examples
1×8=2×4

17. Homework: can you find the cross multiplication
You can write three consecutive fractions ,
and to ensure their cross multiplication result
is same or not.
( you shoule show us the real example)

18. what did you learn
in this lesson