Mental Addition and Subtraction Tips — Math Tricks with Arthur Benjamin

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In this video, "Mathemagician" Arthur Benjamin demonstrates how to easily add and subtract one-, two-, and three-digit numbers in your head. He also teaches you shortcuts using the complement of a number (its distance from 100 or 1000) and demonstrates the uses of mental addition and subtraction for quickly counting calories and making change. If you like this video on mental math, check out all the other videos in our "Mental Math" playlist.

0:00 Intro
0:41 Adding One-Digit Numbers
1:40 Adding Two-Digit Numbers
5:10 Adding Three-Digit Numbers
11:20 Subtracting Two-Digit Numbers
14:50 Subtracting Three-Digit Numbers
18:23 Using Compliment Numbers
23:20 Using Three-Digit Compliment Numbers
25:00 Using Compliment Numbers to Make Change
28:43 Summary and Recap

Presented by Arthur Benjamin

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#MathTricks #Mathemagic #ArthurBenjamin

[lalalali]

This man is a real legend. He just not keep his secrets to himself but share it with every body so that everyone can benefit from it. Love you sir

[theohaywood]

Even now, as a 27 year old I struggle to add large numbers in my head. This video is very helpful to me and I think this video is very useful if you don't know how to add or subtract or if you can add and subtract but cannot do it in your head efficiently. Please don't delete this video as its very handy and very informative and keeping the video on YouTube would be beneficial for anyone and everyone.

Great work. 👍🙌🙌🙌👏👏👏👍👍

[gravitationalwaverider]

Been teaching my 8 yo granddaughter this. She's in the third grade but tests in the 94 percentile at a 5th+ grade level. This should be taught everywhere.

[pfjvfln]

Literally one minute in and I already learnt something so useful. This guy is a genius.

[respectableaf]

My 4 year old loves these videos, math fascinates him. He is only in kindergarten but is a few years ahead of his peers when it comes to math and looks forward to school. I just hope his future teachers will be just as great and informative. They way Arthur Benjamin makes math easy and interesting is a skill in itself.

[marychieng]

I did this method to my 5 year old and do mentally. She now can add 3 digits mentally. The trick is you have to do every single day. She can also minus in 2 digits. She just 5. This method works wonder

[tanjagiljevic]

This is wild! No one ever taught addition/subtraction in this manner.

[byronjaya]

Thank you for making this video, I am 50 years old and love math and now more, this gentleman has an amazing way to teach . I watch all his videos and I am teaching to my kids 6 and 11 years old. Again thank you .

[kosmik_psychology]

He´s so good at explaining these concepts. Even though I knew these concepts from other videos already, I enjoyed every second of it. Wish I had math teachers that could have taught me that when I was younger, its a game changer and makes doing math fun

[hq]

19:13 This is exactly what the fck I was missing, THIS THIS RIGHT HERE dear god thank you. An entire decade of piss poor math education solved in an INSTANT.

[nanda]

I am studying chemical engineering and I am here because I am not a native English speaker and I want to move to Ireland.
It seems simple, even strange, "why is an engineering student here? I shouldn't know this". I know, I know very well, but getting used to math and calculus in English can help me when I go to Ireland.
"You don't build a pyramid from the top to the bottom, if there is no base, there is no pyramid"

[drdentin]

His mental calendar is fantastic. I use it all the time.

[sdmohan]

Arthur benjamin is the best mathemegician in the world i have every single piece of his book

[randomazed]

Also, thank you so much, these videos are incredible. I'm 39 and about to go back to school, wanted to brush up on my math and you have been most helpful!!

[Galina-ekgj]

Thanks for your video, it really helped me with fast metal addition

[lovetownsend]

a min and 30 seconds in and I already learned something, jeezes. The way he said "it'll be 60...something." new way of looking at it, one step at time instead of all at once.

[Gojira-bt]

i was just seeing your 2013 vid like your content cuz i am weak in maths

[azrielagua]

this is the most helpful vid i've ever seen

[MidhunTalks]

Wonderful class very helpful thank you sir

[deanotmani]

My advice for none native English speakers, you might want to do these mental calculations in your original language.. you're mind will put the energy of translation towards calculation therefore faster processing