How many of you know multiplication tables from 1 to 20 by heart?
I just tested myself and found that I do know the tables from 1 to 20. Messed up a between 21  30.
What about you?
What about you?
Replies

Jeffrey ArulrajI can manage till 23 that is the max I have tried beyond that it will be (20+x)*multiplier algorithm
This is really helpful even in other calculations 
Sarathkumar ChandrasekaranAfter learning to multiply i forgot the tables.I dont think Everyone should know more than 20table.Upto ten table is enough.

Shailaja TiwariI rememeber tables from 114 .(and while teaching my younger brother I brag that I know till 25π ).

Abhishek RawalYou guys are genius.I can't go ahead of 12.
Can you remember addition of two single digit hex number ?
I have a trick for that π 
Shailaja Tiwari
SHARE IT .SHARE IT .SHARE IT .SHARE IT .pLEASE .πAbhishek RawalCan you remember addition of two single digit hex number ?
I have a trick for that π 
mail154Abhishek RawalYou guys are genius.I can't go ahead of 12.
Can you remember addition of two single digit hex number ?
I have a trick for that π
yes i too π can't go beyond 12. surprised people talking 20,25 like that. after the knowledge on multiplying i too forget tables π π 
Abhishek Rawal
Let's not make it easy as pie :shailaja revathiSHARE IT .SHARE IT .SHARE IT .SHARE IT .pLEASE .π
Jot down all single digit hex addition in one piece of paper.
You'll understand it's pattern.
Start memorizing.
Send me 50$ & I will create pattern for you.
Hint : Trick is available somewhere in corner of internet. 
Jeffrey ArulrajHex and stuff with math I am game I love it and tricks I am in, do reveal it here mate
Abhishek RawalYou guys are genius.I can't go ahead of 12.
Can you remember addition of two single digit hex number ?
I have a trick for that π 
Abhishek Rawal
One more hint for you :ConquerorHex and stuff with math I am game I love it and tricks I am in, do reveal it here mate
Assembly programming in x86 system using linux have some of it's tips. But those tips won't be helpful until you yourself write down in a paper.
Okay, I will write one more ebook for this. π 
Anoop Kumar
Why not up to 15 π², table of 15 is easiest one between 1219 π.shailaja revathiI rememeber tables from 114 .(and while teaching my younger brother I brag that I know till 25π ).
I still remember those table but I don't need them as combination of multiplication and addition trick is easy to do it.
Not sure which trick you are talking about.Abhishek RawalCan you remember addition of two single digit hex number ?
I have a trick for that π
Here is trick to convert hex to binary and vice versa
Example: convert a each hex into individual binary in 4 digit of binary. and club them. like: C4 = 11000100 will be C=1100 and 4 = 0100 and vice versa for binary to hex.

Shailaja Tiwari
Surely I'll try .Well thanks for the trick(atleast idea :something is better than nothingπ )Abhishek RawalLet's not make it easy as pie :
Jot down all single digit hex addition in one piece of paper.
You'll understand it's pattern.
Start memorizing.
Hint : Trick is available somewhere in corner of internet. 
Shailaja Tiwari
Actually I remember 15's table only upto 5 or 6 and after that I start inventing my own maths.πianoopWhy not up to 15 π², table of 15 is easiest one between 1219 π.
[/CODE] 
madhu27Only upto 12.You people have great memory, i suppose.

Abhishek Rawal#LinkSnipped# You're talking about binary to hex conversion & vice versa. I am talking about hex addition.
For eg : E+9=17H, E+C=1AH.
I hope you understand what I am tryna say π 
nareshkumar6539
We know single digit hex number in decimal numberAbhishek RawalYou guys are genius.I can't go ahead of 12.
Can you remember addition of two single digit hex number ?
I have a trick for that π
Eg: For 'A' equivalent decimal number is 10
First convert those single digit hexa number into Decimal then add
if the resultant sum is less than or equal to 15 result it self is the sum.
If the resultant sum(lets say sum) is greater than 15 then
SUM (2 digit number) is Quotient(sum/16)Remainder(sum%16)
Example:
1) adding 4 and 5 hexa decimal numbers sum is 9
2)adding 'A' and 'F' hexa decimal number Sum is 19
Decimal equivalent of A is 10 and decimal equivalent of 'F' is 15 add those
result is 25 it is greater than 15 so
When we divide 25 with 16 then Quotient is 1 that is first digit in sum and remainder(9) is second digit in SUM
SUM('A'+'F') is 19 in Hexa decimal number 
Abhishek Rawal
Too long, too easy & too damn elementary, buddy.nareshkumar6539We know single digit hex number in decimal number
Eg: For 'A' equivalent decimal number is 10
First convert those single digit hexa number into Decimal then add
if the resultant sum is less than or equal to 15 result it self is the sum.
If the resultant sum(lets say sum) is greater than 15 then
SUM (2 digit number) is Quotient(sum/16)Remainder(sum%16)
Example:
1) adding 4 and 5 hexa decimal numbers sum is 9
2)adding 'A' and 'F' hexa decimal number Sum is 19
Decimal equivalent of A is 10 and decimal equivalent of 'F' is 15 add those
result is 25 it is greater than 15 so
When we divide 25 with 16 then Quotient is 1 that is first digit in sum and remainder(9) is second digit in SUM
SUM('A'+'F') is 19 in Hexa decimal number
I have graphical pattern to remember hex addition
Thanks to a book author π 
Jeffrey Arulraj
But this method is not suited for adding 12EF+ABCD Well the complexity increases herenareshkumar6539We know single digit hex number in decimal number Eg: For 'A' equivalent decimal number is 10 First convert those single digit hexa number into Decimal then add if the resultant sum is less than or equal to 15 result it self is the sum. If the resultant sum(lets say sum) is greater than 15 then SUM (2 digit number) is Quotient(sum/16)Remainder(sum%16) Example: 1) adding 4 and 5 hexa decimal numbers sum is 9 2)adding 'A' and 'F' hexa decimal number Sum is 19 Decimal equivalent of A is 10 and decimal equivalent of 'F' is 15 add those result is 25 it is greater than 15 so When we divide 25 with 16 then Quotient is 1 that is first digit in sum and remainder(9) is second digit in SUM SUM('A'+'F') is 19 in Hexa decimal number 
Prashanth Rajyeah i was forced to byheart ...........
we were having special periods for tables and abacus calculations............... 
Nayan GoenkaI once had tables till 50 by heart. Squares of numbers till 60 and cubes of numbers till 40. this was around school time when you appear for competitive exams like scholarship and stuff and I was a complete geek back then. Its a miracle if I pass all subjects now. (Bigger miracle if I get to appear the exam, always get detained π)

rahul69
I tried to create one, here is it:Abhishek RawalLet's not make it easy as pie :
Jot down all single digit hex addition in one piece of paper.
You'll understand it's pattern.
Start memorizing.
Send me 50$ & I will create pattern for you.
Hint : Trick is available somewhere in corner of internet.
 Add the decimal equivalents of two single digit hex numbers
 If result less than 16 then it's hex equivalent is the answer, else subract it by 6
 If result after above step is less than 20 then it is the answer, else write it as : 2n > 1(1n), convert 1n to hex, and we get the result.
Suppose we have to add E and A.
Now adding their decimal equivalents,we get: 14+10=24
As 24>15 apply rule 2, ie subtract 6 : 246=18
as 18<20 Hence 18 is the answer, ie E+A = 18 
Nayan Goenkarahul69I tried to create one, here is it:
 Add the decimal equivalents of two single digit hex numbers
 If result less than 16 then it's hex equivalent is the answer, else subract it by 6
 If result after above step is less than 20 then it is the answer, else write it as : 2n > 1(1n), convert 1n to hex, and we get the result.
Suppose we have to add E and A.
Now adding their decimal equivalents,we get: 14+10=24
As 24>15 apply rule 2, ie subtract 6 : 246=18
as 18<20 Hence 18 is the answer, ie E+A = 18
Are you trying to do BCD addition? 
rahul69
Nope, I am doing single digit hex addition, maybe that 6 confused you, as we add 6 in BCD addition, but I am subtracting 6, and it is totally a different story πNayan GoenkaAre you trying to do BCD addition? 
kheerthi chandrutill 12 is only possible fr me.. but i did not find any need to by heart after tat..
i am comfortable with 12π
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