What is the difference between the largest and the smallest possible distinct 4-digit number that you can make from four digits 0, 4, 2 and 3?

Given 4 digits: 4, 6, 2, 0. 
What is the difference of the largest and the smallest 4-digit numbers that can be formed from these digits. Use each digit only ones.
Answer: The difference is 

Câu 1) the number is 13 less than 38?
Câu 2) The number of divisors of 1000?
Câu 3) The side in decimeters of a square whose are 16 900cm2?
Câu 4) What is the difference between the largest and the smallest 2-numbers that can be formed by the four digits 0,5,6 and 2?

Using each of the digits 2, 3, 5 and 6 exactly once, form two 2 – digit numbers. What is the difference between the largest possible product and the smallest possible product of two such numbers ?

Using each of the digits 2, 3, 5 and 6 exactly once, form two 2 – digit numbers. What is the difference between the largest possible product and the smallest possible product of two such numbers

Using each of the digits 3, 4, 5 and 6 exactly once to form two 2 - digit numbers. What is the difference between the largest possible product and the smallest possible product of two such numbers?

Giúp mình giải bài toán bằng tiếng anh với. Mình cảm ơn nhiều!

Bài 1. The number of fractions m/n such that m + n = 2016 is..........?

Bài 2. Using each of the digits 2,3,5 and 6 exactly once, form two 2-digit numbers. What is the difference between the largest possible product  anf smallest possible product of two suchnumber?

The difference of a 3 digit number and the smallest 3  digit number is just before of the greatest 2 even digit number . The 3 digit number is ......

using each of a digit 3,4,5 and 6 exactly once to form two 2 digit numbers .what is the different between the largest possible product and the smallest possible product of two such number