Fast Math Trick to subtacting numbers mentally - two digit numbers

TL;DR

Learn different methods for mental subtraction, starting with easy two-digit numbers and progressing to harder problems.

Transcript

good day welcome to the techmath channel what we're going to be having a look at in this video is we're going to be looking at methods for mental subtraction okay so it's going to start out fairly easy we're going to start out with some uh two-digit numbers we're going to get to some harder problems as we go along though now there's a couple of dif... Read More

Key Insights

• 🍳 Mental subtraction can be done by breaking the number being subtracted into its individual digits or by rounding it up to the nearest ten.
• 🏛️ Starting with simpler examples can help build confidence and understanding in mental subtraction.
• 🤝 The second method of rounding up can be a helpful strategy when dealing with larger numbers.
• 🎭 Mental subtraction is a useful skill to develop in order to perform quick calculations without relying on paper and pencil.
• 🎮 The video hints at extending the concepts to larger numbers in a future video, indicating that there is more to learn in the topic.
• 🦻 Writing down the steps in the process can be helpful initially but the goal is to eventually perform mental subtraction without external aid.
• 🎮 Mental subtraction requires practice to become proficient, but the techniques demonstrated in the video can make it easier.

Questions & Answers

Q: What are the two methods for mental subtraction explained in the video?

The first method involves breaking down the number being subtracted into its individual digits, while the second method involves rounding up the number being subtracted to the nearest ten.

Q: How do you use the first method for mental subtraction?

In the first method, you break down the number being subtracted into its individual digits and subtract them from the original number. For example, if you're subtracting 23 from 98, you would subtract 20 first and then subtract 3, resulting in an answer of 75.

Q: How do you use the second method for mental subtraction?

In the second method, you round up the number being subtracted to the nearest ten and adjust the final answer accordingly. For example, if you're subtracting 59 from 84, you would round up 59 to 60, subtract 60 from 84 to get 24, and then add 1 back to the answer since you rounded up one too many, resulting in an answer of 25.

Q: What are some examples of mental subtraction problems demonstrated in the video?

Some examples include subtracting 25 from 68, subtracting 59 from 84, subtracting 34 from 82, and subtracting 48 from 67.

Summary & Key Takeaways

• This video explains different methods for mental subtraction, starting with simple examples and gradually progressing to more complex ones.

• The first method involves breaking down the number being subtracted into its individual digits and subtracting them from the original number.

• The second method involves rounding up the number being subtracted to the nearest ten and adjusting the final answer accordingly.