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.
Can you figure out the correct solution?
Here is the challenge, in the picture below.
At the top of the picture, we see the task and then four possible answers.
Which solution do you think is the correct one?
How did you come up with it?
Take your time and think about it to find the correct solution.
Done? Below you can check if you picked the right number!
A
B
C
The correct answer
The correct answer is B: 12.
Why is 12 the correct answer?
Well, if you remember from your school days, according to the order of operations, you do multiplication before addition and subtraction, so you start by solving 3 x 3, which results in 9.
Then we are left with a simpler math problem: 3 + 9 – 3 + 3
The answer is therefore 12.
Did you pick the correct number? Congratulations!
Incredibly practical vintage tool with an obvious use for a particular job field
The Feeler Gauge Tool’s Legacy and Impact on Contemporary Tools
Precision measurement tools of today bear witness to the history of the antiquated feeler gauge instrument. The basic idea of measuring gaps with tiny blades has not altered, despite the increasing use of digital and electronic gauges. The feeler gauge has influenced modern tools, which aim to provide the same level of accuracy and dependability in their design and operation.
Collector’s Piece
Antique tool collectors and hobbyists now value vintage feeler gauges highly. These objects are prized for their historical relevance, quality craftsmanship, and robustness. Because they value the inventiveness and usefulness of early 20th-century engineering instruments, collectors frequently look for sets that have been preserved well.
Teaching Instrument
Moreover, vintage feeler gauges are instructional resources that shed light on the development of precision measurement. They are used to instruct students in the principles of mechanical measurement and the value of accuracy in engineering in technical schools and training programs.The history of precise measuring has been greatly influenced by the old-fashioned feeler gauge equipment. Its application across a range of industries, including manufacturing and the automobile industry, has guaranteed precise machinery assembly and maintenance. It still has an impact on contemporary tools today, and both educators and collectors cherish it. The feeler gauge’s legacy serves as a constant reminder of the value of accuracy and the long-lasting effects of straightforward yet efficient engineering solutions.
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