Why does 99 + 9 divided by 9 equal 100?

A seemingly simple calculation has sparked much debate because of its unexpected result of 100.

Small math puzzles often confuse us not because they are difficult, but because the brain tends to calculate based on habit. The calculation 99 + 9 divided by 9 is a prime example.

When faced with this calculation, many people will immediately add first and then divide. Following this approach, they might arrive at completely different results. However, in mathematics, calculations always follow a specific order; you can't just calculate one part first.

It is precisely because of this "hasty" thinking that many people overlook this important rule. When applying the calculations in the correct order, the final result leads to a number that surprises many: 100.

Have you found the solution to this riddle yet?

Why does 99 + 9 divided by 9 equal 100? (Illustrative image).

After you find the answer, please leave your reply in the comments section.

KHANH SON

Source: https://vtcnews.vn/tai-sao-99-9-chia-9-100-ar1007335.html