Explain how comparing 645 and 738 different from comparing 645 and 649

For 645 and 738:
 For these numbers we have that the difference between both is:
 738 - 645 = 93

 For 645 and 649:
 For these numbers we have that the difference between both is:
 649 - 645 = 4

 Therefore, comparing the first two numbers of the second two numbers is different because the difference between the first two numbers is much larger.

 
 The difference between the first two numbers is much greater than the difference between the second two numbers.

Comparing both the pairs of number is different as difference in first pair is greater than difference in the second pair.

Step-by-step explanation:

At first pair we can see that the 645 and 738 begin with different numbers, one has 6 and other has  7.  In middle, one has 4 and the other has 3.  At last, one has 5 and the other has 8.  

So to find difference we need to subtract by taking carry, we get

738-645=93

In the second pair,645 and 649, begin with same number 6. In middle, Both have 4. At last, one has 5 and other has 9.  

To find difference we need to just find the difference between the third digit as other are same.

Therefore 649-645=4

So comparing both the pairs of number is different as difference in first pair is greater than difference in the second pair.

You will need 60 cubics units