Lesson 6 Addition and subtraction of the fraction with same denominator

Review. Write down the fraction of the coloured part. 1 4 2 4 3 5 1 5

+ = 1 4 2 4 3 4 ？ 1 4 2 = 3 +

1 4 2 = 3 + 3 10 1 = + 4 10

1 4 2 = + 4 1 + 2 3 4 = 3 10 1 = + 10 3 + 1 4 10 = Add the numerator , and don’t change the denominator.

= = = = = = Exercises: 1 8 3 + 1+3 8 4 8 5 17 8 + 5+8 17 13 17 9 20 7 9+7 20 = = 16 20

Exercise 1: calculate. 3 5 7 =1 2 19 7 18 13 17

Exercise 2: fill in the blank. 4 7 3 9 3 18 1

Exercise 3: 1 5 A little rabbit jump forward m for the first time, the second jump forward m, How many meters is the rabbit jumped altogether. 2 5

Exercise 3: 10 12 = 4 12 = 14 16 = 4 16 = 9 = 1 8 = 1 =

Exercise 4 1 6 1 6 1 6 1 6 + + + (1) 1 8 1 8 1 8 1 8 1 8 1 8 + + + + + (2)

+ + + + + + Exercise 4:calculate. 1 9 1 9 1 9 1 10 1 10 1 10 1 10 1 10 (1) 1 10 1 10 1 10 1 10 1 10 + + + + (2)

Lesson 7 Exercises:

Lesson 7 Exercises: