# Multiplying multiple digit numbers | Multiplication and division | Arithmetic | Khan Academy | Summary and Q&A

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October 2, 2009
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Multiplying multiple digit numbers | Multiplication and division | Arithmetic | Khan Academy

## TL;DR

This video provides step-by-step examples and techniques for solving multiplication problems, all without using a calculator.

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### Q: What is the purpose of this video?

The purpose of this video is to demonstrate various techniques for solving multiplication problems without using a calculator. It aims to help viewers become more proficient in mental math.

### Q: How are multiplication problems solved mentally in this video?

The video shows a step-by-step approach to mental multiplication, starting from solving smaller products and gradually building up to larger numbers. It emphasizes the importance of being careful and avoiding mistakes during the process.

### Q: What is the significance of correctly placing zeroes when multiplying by multiples of 10?

When multiplying by multiples of 10, such as 10, 100, or 1,000, it is crucial to place the correct number of zeroes in the product. This ensures that the value of the number is accurately represented in the correct place value.

### Q: Why is it important to practice mental multiplication?

Practicing mental multiplication helps improve calculation speed, builds number sense, and reduces reliance on calculators. It also enhances problem-solving skills and provides a foundation for more advanced mathematical concepts.

## Summary & Key Takeaways

• The video demonstrates how to solve multiplication problems using mental math.

• Multiple examples are given, including multiplying two-digit numbers and multiplying three-digit numbers.

• The importance of being careful and avoiding careless mistakes when multiplying is emphasized.