The Question
A 4-digit integer is shown on a digital screen. If you turn the screen upside down, the new number is 1716 less.
Find the original number.
This is at the level of a lower secondary national mathematics competition.
Try to share your method so as to help each other learn new techniques and strategies.
Come and check out Brainsteem challenges and other Mathematical posts currently live!
Brainsteem Mathematics Challenges - Digital Sum
Adding LaTeX functionality for inline mathematical and scientific notation
Mathematical Arts - Robert Voorheis, Soft Fractures, Video
Professor Pailyn's Puzzles - Borromean Number Rings
Brainsteem Mathematics Challenges - Brilliant Numbers
Brainsteem Compute #3 Prize Computational Maths Puzzle [Win 40% and 10% in SBD]
Brainsteem #9 Prize Maths Puzzle [Win 40% and 10% in SBD]
Brainsteem Compute #2 Prize Computational Maths Puzzle [Win 40% and 10% in SBD]
Please upvote, resteem and follow 
And don't forget to upvote each other's comments to bring cheer to the whole community!