MathDB

Math Prize 2016 Problem 3

Source:

September 12, 2016

Math Prize for Girls

Problem Statement

Compute the least possible value of

ABCD - AB \times CD

, where

ABCD

is a 4-digit positive integer, and

AB

and

CD

are 2-digit positive integers. (Here

A

,

B

,

C

, and

D

are digits, possibly equal. Neither

A

nor

C

can be zero.)

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