Challenge: Can you solve this math problem for middle schoolers – without a calculator?Classic brain training methods are perhaps puzzles like crosswords or sudoku,

but I have recently become more attracted to the type of challenge you’ll see below. These puzzles

have been flooding the web lately, probably because they are really fun! These are old classic mathematical problems.

When you were in middle or high school. These math problems are more fun when you find yourself trying to remember the math you learned as a child.