Hidden Numbers in Picture Eye Test Challenges and Answers

Here are 5 picture puzzles that will test your power of observation. In each of these picture puzzles, there is one number hidden. Your challenge is to find this hidden number in each given picture. 
Answers to these hidden numbers picture puzzles are given immediately in this puzzle video. However, there is one extra bonus hidden number picture puzzle at the end. Post your answer for this hidden number picture riddle in the comments.

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