Fractions(5) LO: Compare the value of unit fraction

Review Unit fractions Numerator Fraction line Denominator If the whole is divided into( ) equal parts, then each part is ( ) of the whole. 4 5 3 2 1 — 4 3 1 1 — 5 1 — 2

Compare Which one is bigger?

1 — 2 1 — 4 <

1 — 2 1 — 4 >

1 — 4 = 1 — 2

Different sizes of the whole Why? Different sizes of the whole 1 — 2 1 — 4 > 1 — 2 1 — 4 < 1 — 4 = 1 — 2

the same whole 2 1 3 1 > 4 1 6 1 > >

3 1 3 1 Meter meter meter meter 1 Metre is divided into ( ) equal parts, each part is of 1 Metre. 3 1 3

Q1: Which is the longest? Which is the shortest? The Same Whole 1 meter ( ) meter ( ) meter 1 6 — ( ) meter ( ) meter Q1: Which is the longest? Which is the shortest? Q2:Can you compare these unit fractions with “>”?

more equal parts you divide, Conclusion For the same whole, the more equal parts you divide, the less each part you get. 　　　　 1 _ 1 1　　　　　　　　　　 — 4 —— —— 8 8 4 (less) (more) Denominator Numerator

In unit fractions, if the Conclusion In unit fractions, if the denominator is bigger, then the value of the unit fraction is smaller. 　　　　 1 1 _ 1　　　　　　　　　　 — 4 —— —— 8 8 4

Exercise1: Write down the fractions according to the pictures, then compare the value of them with the sign of “＞”、“＜”or “＝”

Compare them and link with “>” : Exercise2: If I use “1”to express a whole, estimate the colored part and write down the fraction. 1 1 — 2 1 — 3 1 6 — Compare them and link with “>” :

Exercise3: Compare the value of the fractions.

Challenge1: If , then what number can you choose to fill in ( ) Challenge1: If , then what number can you choose to fill in ( )? Discuss with your partners. 1 2 3 4 5 6 7 8 9 10

Why have we used different fractions to express the same pink square？ Challenge2: Use fractions to express the pink square. 1 — 2 1 1 — 4 1 — 6 1 — 3 Thinking: Why have we used different fractions to express the same pink square？

1 4 1 6 Challenge3: The colored part is of the rectangle A. The colored part is of the rectangle B. 4 1 6 Rectangle A Rectangle B