Shanghai South Pudong Road Primary School Teacher: Jin Qi

what I have taught this week 1 Part and whole ,Know the unit fractions. 2 Know the not unit fractions,and they were composed of unit fractions. 3 Compare unit fractions and fractions with same denominator.

Compare Fractions Unit fraction and fractions with same denominator

Quick Response: 1 3 2 1 3 6 ＞ ＞ 3 4 2 6 9 8 ＞ ＞ 1 8 5 9 11 ＝ ＞

Review: Let us sum up unit fraction same doneminator

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

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.

Compare: Which one is bigger? 2 3 4 use your own ways to show me

Compare fractions WHAT? WHY? with same numerators

Compare: Which one is bigger? 2 3 4 >

Use unit fractions to tell me why?

Fraction Wall has ( ) 2 has ( ) 2 > >

Compare: < 5 5 > < Which one is bigger? 3/9 has （ ） 1/9 8 < 5 3/9 has （ ） 1/9 5 3/8has （ ） 1/8 1/9 （ ） 1/8 > < 3/9 （ ） 3/8

Compare: <

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

Exercise 1:Fill the blank with ”>”、”<”、”=” 1 10 1 22 12 16 12 15 > < 17 20 17 100 3 5 > < 1

Exercise 2 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

Exercise 3:Fill the brackets with right numbers 1 4 2 7 5 3 6 ( ) ＜ 8 8 5 5 5 ＜ ＜ 6 10 9 ( ) 7 8 7 11 ( ) 4 = = 11 4 ( ) 7

Exercise 4: Order these fractions from least to greatest 4 19 4 9 2 19 2 19 4 19 4 9 < <

Challenge 1:Order these fractions from least to greatest 1 1 3 1 5 8 6 15 6 6 ﹤ ﹤ ﹤ ﹤ 3 5 1 1 1 8 6 6 15 6

C They have the same speed D Can not judge Challenge 2 Tom and John departure from Cambridge to London in same way by car .Tom used 3/4 hours. John used 3/5 hours.who is faster? ( ) B A Tom B John C They have the same speed D Can not judge

what did you learn in this lesson

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