use 4,6,2,7 to make the sum as 100

Question

Here are four digits. 4,6,2,7

Use all four digits to make this sum correct

 

---- + ----- = 100

Answer 1

Write the possible numbers this way and remember how you first learned to add:

 

      # A

      # B

   --------

   1 0 0

 

In order to get 0 in the one's place of the sum, (A+B) must equal 10 (that is, 0 with 1 as a carry).  Given the numbers 4, 6, 2, 7, the only two numbers that add up to 10 are 4+6.

 

Since addition is commutative (that is, either number may be "on top"), we now have:

    1

    C  4

    D  6

 ---------

  1 0  0

 

(1+C+D = 10), so (C+D = 9), right?   That's how you use 7 and 2.  Does it matter whether you get 74+26 or 24+76 as your answer?  No, because 74+26 = 100 and 74 + 26 = 100.

 

There are two possible answers !

Answer 2

Here are four digits. 4,6,2,7
Use all four digits to make this sum correct
74       26
---- + ----- = 100