The rule
For math notation, the rule is the part that still works when you try new examples. Math as a Language puts it in context with practice.
Why it works
Example: multiplying both sides of a true equation by the same nonzero number gives another true equation, because every term was scaled by the same factor. The same “do it to both sides” logic carries over to math notation.
Small numbers
Try 2 + 3 = 5. Multiply both sides by 4: 8 + 12 = 20. Still true. That is the same idea as “do the same thing to both sides” when you solve.
Test it
The rule A quick test
Try values
Core lesson
Related: Math as a Language. Use the calculator with your own numbers when the example is not close to your case.
Use the calculator
FAQ
- Where is the main lesson?
Math as a Language has the full topic, examples, and practice links.
- Which calculator first?
After your setup is on paper, open Fraction for a quick numeric pass.