Mental Multiplication Math Trick - Multiply numbers in your head near 100 | Summary and Q&A

TL;DR

Learn how to multiply numbers near 100 quickly using the base method of mental multiplication.

Key Insights

• ✖️ The base method of mental multiplication is a quick and efficient way to multiply numbers near 100.
• #️⃣ By using a base number such as 100, the calculation becomes easier as it involves adding or subtracting smaller numbers.
• 🪜 Cross adding helps to simplify the multiplication process and obtain the initial part of the answer.
• ⚾ The base method encourages mental calculations and is useful for practicing mental math skills.
• 🤘 The process can be applied to larger numbers as well, and it is important to keep track of positive and negative signs when subtracting or adding differences.
• ⚾ Practicing with various examples of the base method can improve mental math abilities.
• ⚾ The base method can be used for numbers beyond 100 by adjusting the base accordingly.

Transcript

good day and welcome to the tech maath Channel what we're going to be having a look at in this video is a really really Rapid Way of mental multiplication called the base method multiplication this time we're looking around numbers around 100 so in previous videos we've looked at numbers around 10 20s 30s 50s okay and where we might be multiplying ... Read More

Questions & Answers

Q: What is the base method of mental multiplication?

The base method involves using an easier number, such as 100, to simplify the multiplication process, especially for numbers near the base. It helps to rapidly calculate the answer.

Q: How do you determine the difference between the number and the base?

To find the difference, subtract the base (e.g., 100) from the given number. This will give you the number of units it is above or below the base.

Q: What is cross adding?

Cross adding is the process of adding the differences of the numbers to the base. For example, if the first number is 105 (5 more than 100) and the second number is 7 (7 more than 100), you would cross add 105 + 7 or 107 + 5 to get the same answer (112).

Q: How do you calculate the final answer using the base method?

Once you have the cross added result, you multiply it by the base (e.g., 100) to get the first part of the answer. Then, you multiply the differences of the numbers and add or subtract that from the answer, depending on the signs, to get the final result.

Summary & Key Takeaways

• This video teaches a rapid method of mental multiplication called the base method, focusing on numbers near 100.

• The base method involves using an easier number, such as 100, to help with the multiplication process.

• By determining the difference between the number and the base, cross adding, and multiplying, one can quickly calculate the answer.