Number puzzles arranged in a column

Puzzles, riddles, brain teasers, conundrums, logic questions in pictures. You need to understand the relationship between the numbers and replace the question mark. These intelligence riddles, brain teasers and number problems are arranged in a column. To check your answer, click on the «Answer» button located below the task. After this, the correct answer and explanations will appear. Below you can select other questions on this topic. Typically each topic has 20 questions or more. At the same time, the complexity of logical problems gradually increases. First there will be easy questions, then medium, then difficult. Try to complete tasks as quickly as possible.