In this puzzle, numbers are positioned at the corners and inside the triangles. Your task is to find the relationship between these numbers and figure out the missing value in the final triangle.

A picture circulating online challenged people to determine the missing number from what looked like a simple sequence of numbers from 1 to 19. "Which number is missing?" the puzzle asks.

Puzzles9 shared a brain teaser with nine squares, one missing a number. The challenge is to figure out how the numbers are related and fill in the missing one. Can you solve it?

A popular online math puzzle involves finding a missing number in triangles by using a simple addition rule. Engaging with such puzzles strengthens cognitive skills and problem-solving abilities ...