## Mental Math: Doubling and Halving

Summary

The content focuses on a mental math trick of doubling and halving to simplify multiplication problems, particularly useful for the GRE exam's Quant section.

- Doubling one factor and halving the other in a multiplication problem does not change the product, making calculations easier.
- This trick is especially useful when one of the factors ends in 5 or 50, as doubling it results in a round number, simplifying the multiplication.
- Practicing this trick can significantly speed up calculations, saving valuable time during the exam.
- The trick can be applied multiple times in succession for factors like 25 or multiples of 25, further simplifying calculations.
- Examples and practice problems demonstrate how to apply this trick effectively, highlighting its utility in making seemingly difficult calculations manageable.

Chapters

00:00

Introduction to Doubling and Halving

00:16

Applying the Trick

02:06

When to Use the Trick

02:53

Practical Examples

05:37

Summary and Importance

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