Simple addition and subtraction problems spark controversy.

A quick math problem shared on social media has sparked debate about its correctness. The problem presented the sequence: '66 - 6 + 7 + 23 - 18 + 2'. Students followed the rule of calculating from left to right and arrived at the answer 74. However, the teacher provided a different answer, pointing out the correct method by grouping the numbers to get an even result.

After the problem was published, two opposing viewpoints emerged:

This is an extremely difficult puzzle because if you make even one wrong step, the entire problem will be 100% wrong.

"She had the right to merge the data, but she made a mistake with the sign during the merging process, so her result is still incorrect," one user argued.

Meanwhile, one reader commented: "This is a quick calculation problem, requiring speed, so you have to group the operations that give you the fastest result. The way she calculated it is correct."

Lam Hoang

Source: https://vtcnews.vn/bai-toan-cong-tru-don-gian-gay-tranh-cai-ar911037.html