Cube Roots in 2 sec using Vedic Math Trick | Summary and Q&A

TL;DR

Learn how to calculate cube roots for numbers between 1 and 100 instantly using a simple trick.

Key Insights

• 🧊 The trick for calculating cube roots quickly relies on identifying patterns among pairs of digits and using a table of cube values for numbers 1 through 9.
• ◀️ The pairs 2 and 8, as well as 3 and 7, have reverse patterns compared to other pairs.
• #️⃣ In cases where the closest table number is not an exact match, we choose the next number below it for a more accurate approximation.

Transcript

good day and welcome to the tech math Channel what we're going to be having a look at in this video is a way of working out cube roots and these are for numbers whose cube root value lies between 1 and 100 it's a really really good little trick uh it's one you can really amaze your friends on it does require a tiny little bit of work but it's once ... Read More

Questions & Answers

Q: How does the trick for calculating cube roots work?

The trick involves looking at the last digit of the number and finding its corresponding pair among 2, 3, 7, and 8. We then cross out the last three digits of the number and find the closest number in the table that is equal to or less than the remaining digits. This table number corresponds to the cube root, which we combine with the pair to get the final answer.

Q: Are there any exceptions to the trick?

Yes, the pairs 2 and 8, as well as 3 and 7, have unique patterns. Instead of following the usual rule, they end up with reverse pairs. For example, a number ending in 2 pairs with 8, and a number ending in 8 pairs with 2. Similarly, a number ending in 3 pairs with 7, and a number ending in 7 pairs with 3. These exceptions need to be remembered.

Q: What if the table number in the trick is not an exact match?

In cases where the closest number in the table is not an exact match, we choose the next number below it. This ensures that we do not exceed the cube root value we are looking for.

Q: Does the trick require memorization of the table?

Yes, to use the trick effectively, it is necessary to memorize the cubes of numbers 1 through 9, as mentioned in the video. Although it may require some initial effort, with practice, the memorization will become easier and faster.

Summary & Key Takeaways

• This video teaches a method for quickly calculating cube roots for numbers between 1 and 100.

• The method involves using a table of cubes for numbers 1 through 9 and finding patterns among them.

• By identifying specific pairs and applying the trick, one can calculate cube roots mentally and impress others.