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What knowledge of primary school mathematics has been transformed? At least eight. Tell me about what you used when you studied.
1, derivation of parallelogram area formula: transforming parallelogram into rectangle.

2. Derivation of triangle area formula: put two identical triangles into a parallelogram.

3. Derivation of trapezoid area formula: Put two identical trapezoids into a parallelogram.

4. Derivation of circle area formula: Transform a circle into an approximate rectangle.

5. Derivation of the cylinder volume formula: transform the cylinder into a cuboid.

6. Take the whole ten or hundred in simple calculation, such as: 253-99=253- 100+ 1.

7. Transformation of numbers and formulas: 25× 16=25×4×4 16 is transformed into 4×4.

8. Number to number conversion:1÷ 0.125 =1÷1/8

..... ratio, division, fraction, decimal, percentage conversion, etc.

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