Do oral calculations.

300-6= 7200:9= 320×3= 0: 14=

630:9 = 2 100:7 = 600 x4 = 200×8 =

Second, the column vertical calculation, check with※.

606-6= 639:9= ※404:4=

600:5= 424-8= ※320:2=

Third, solve the problem.

1. A fairy tale book has 4 16 pages, and Xiaohua reads 8 pages every day. How many days can he finish reading this fairy tale book?

The students of grade three and grade four went to plant trees. There are 58 students in Grade Three and 67 students in Grade Four. Five students are divided into one group. How many groups can a * * * be divided into?

There are 272 students in Grade Three. How many tables for two do you need? Put these desks in four classrooms on average. How many people are there in each classroom?