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.
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This problem can be calculated step by step according to the priority of the four arithmetic operations.
In mathematical operations, multiplication and division operations are carried out first, and then addition and subtraction operations are carried out.
For the expression 3+3×3−3+3, first calculate the multiplication part 3×3=9, and at this time the expression becomes 3+9−3+3.
Then perform addition and subtraction operations in sequence from left to right:
- First calculate 3+9=12, and the expression becomes 12−3+3;
- Then calculate 12−3=9, and the expression becomes 9+3;
- Finally calculate 9+3=12.
In conclusion, 3+3×3−3+3=12.