Maths Problem

Mrs Lee’s set were wowed by her mathematical ability ! Pupils were asked to select a 4 digit number where all the digits were different (not including 0) eg 4532 and then they had to jumble the numbers up anyway they liked eg 3542. Once they had their two numbers they were asked to subtract them. 4532 – 3542. With the answer they had they had to circle any number they like, they then told Mrs Lee the numbers they hadn’t circled and Mrs Lee used her magic brain to tell them the number they had circled ! – can you work out how she knew ?????

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