Simple operation problems of mathematical division in the fourth grade of primary school students

Example 1. Calculate the following questions in a simple way:

1、725÷25: 2、7800÷25÷4 3、734×999 4、 10 1× 10 1- 10 1

Exercise 1. Skillfully answer the following questions:

( 1)47600÷25: (2)9 1000÷ 125÷8 (3) 132476× 1 1 1

(4)6 17×958+6 17× 1043-6 17

Example 2: Clever calculation of (1+23+34) × (23+34+65)-(1+23+34+65 )× (23+34).

Example 2: Calculate 9999+9999× 9999

Exercise 1, calculation: (1) 9999× 2222+3333× 3334: (2)1234×10001.

(3) 1 1 1 1 1×99999 (4)456×567567-567×456456