Review: Calculate: 2 8 2 12 4 16 3 6

Fraction Wall

Ⅰ. Find equivalent fractions

1 2 1 5 = = 2 4 2 10 3 1 6 1 = = 6 2 2 12 1 4 1 8 = = 8 2 2 16

1 2 1 5 = = 2 4 2 10 1 3 1 6 = = 6 12 2 2 1 4 1 8 = = 8 2 2 16 1 2 = 4 3 6 8 5 10 12 16

1 2 3 4 5 6 8 = = = = = = 8 4 6 10 12 16 2 1 3 = ？ 1 4 = ？

1 2 3 4 5 6 8 = = = = = = 2 4 6 8 10 12 16 1 3 9 2 6 = 4 12 = 3 1 4 = 2 8 = 3 12 4 16

1 2 1 5 = = 2 4 2 10 3 1 6 1 = = 6 2 2 12 1 4 1 8 = = 8 2 2 16

×2 1 2 = 2 4 ×2 ×6 1 6 = 2 12 ×6

Multiply both denominator and numerator by the same , so we get the equivalent fraction.

×2 ÷2 1 2 2 1 = = 2 4 4 2 ×2 ÷2 ×6 ÷6 1 6 6 1 = = 2 12 12 2 ×6 ÷6

Multiply both denominator and numerator by the same , so we get the equivalent fraction. (or divide) (except for 0)

Exercise 1: ( ) 2 3 9 1 = = 4 5 10 ( ) 12 ( ) 8 4 2 6 = = 16 8 ( ) 12 4

Ⅱ. Compare fractions

Ⅱ. Compare fractions 6 1 ( ) 9 3

Ⅱ. Compare fractions 6 1 ( ) ＞ 9 3

Ⅱ. Compare fractions ×3 3 6 1 ( ) ＞ 9 9 3 3 9 ×3

Ⅱ. Compare fractions 6 1 ( ) ＞ 9 3 2 1 ＞ 3 3

Ⅲ. Calculate.

Ⅲ. Calculate. 6 1 + ÷3 12 4 2 6 = 4 2 + 1 12 4 = ÷3 3 = 4

Ⅲ. Calculate. 6 1 + × 3 12 4 3 1 = 12 6 + 3 4 12 = ×3 9 = 12

× 3 4 3 12 9 = × 3

Lesson 8 Exercises: 1. Find the equivalent fraction with the fraction wall. 2 4 2 3 4 6 6 6 8

Lesson 8 Exercises: ＞ ＜ ＞ ＜ 2 9 3 12 2. compare the value of them with the sign of “＞”、“＜”or “＝”. ＞ ＜ ＞ ＜ 3 2 12 9

= = = = =1 Lesson 8 Exercises: 12 10 10 2 12 5 3 4 3 1 12 2 4 － + 3. calculate. 12 10 10 2 = 12 5 3 － = 4 3 1 + = 12 2 = 4 =1

Discussion 2 + 6 2 = 3 3 + ( ) ?

2 + 6 2 = 3 3 + ( ) ? 2 + 6 3 + 6 8 9 = 6 9 = 3 2 8 9 ≠ Discussion Multiply (or divide) both denominator and numerator by the same(except for 0), so we get the equivalent fraction. = 3 3 + ( ) ? 2 + 6 3 + 6 8 9 = 6 9 = 3 2 8 9 ≠

Discussion 2 + 6 2 = 3 3 + ( ) ×4 2 3 8 = 12 ×4 3 + 9 9