# 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.

## Replies

• Jeffrey Arulraj
I 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 Chandrasekaran
After learning to multiply i forgot the tables.I dont think Everyone should know more than 20table.Upto ten table is enough.
• Shailaja Tiwari
I rememeber tables from 1-14 .(and while teaching my younger brother I brag that I know till 25😛 ).
• Abhishek Rawal
You 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 😁
• Shailaja Tiwari
Abhishek Rawal
Can you remember addition of two single digit hex number ?
I have a trick for that 😁
SHARE IT .SHARE IT .SHARE IT .SHARE IT .pLEASE .😁
• mail154
Abhishek Rawal
You 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 😁

yes i too 😀 can't go beyond 12. surprised people talking 20,25 like that. after the knowledge on multiplying i too forget tables 😀 😁
• Abhishek Rawal
shailaja revathi
SHARE IT .SHARE IT .SHARE IT .SHARE IT .pLEASE .😁
Let'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.
• Jeffrey Arulraj
Hex and stuff with math I am game I love it and tricks I am in, do reveal it here mate

Abhishek Rawal
You 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 😁
• Abhishek Rawal
Conqueror
Hex and stuff with math I am game I love it and tricks I am in, do reveal it here mate
One more hint for you :
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. 😁
• Anoop Kumar
shailaja revathi
I rememeber tables from 1-14 .(and while teaching my younger brother I brag that I know till 25😛 ).
Why not up to 15 😲, table of 15 is easiest one between 12-19 😛.

I still remember those table but I don't need them as combination of multiplication and addition trick is easy to do it.

Abhishek Rawal
Can you remember addition of two single digit hex number ?
I have a trick for that 😁
Not sure which trick you are talking about.
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
Abhishek Rawal
Let'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.
Surely I'll try .Well thanks for the trick(atleast idea :something is better than nothing😁 )
• Shailaja Tiwari
ianoop
Why not up to 15 😲, table of 15 is easiest one between 12-19 😛.

[/CODE]
Actually I remember 15's table only upto 5 or 6 and after that I start inventing my own maths.😁
• Only upto 12.You people have great memory, i suppose.
• Abhishek Rawal
For eg : E+9=17H, E+C=1AH.
I hope you understand what I am tryna say 😀
• nareshkumar6539
Abhishek Rawal
You 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 😁
We 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
• Abhishek Rawal
nareshkumar6539
We 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
Too long, too easy & too damn elementary, buddy.
I have graphical pattern to remember hex addition
Thanks to a book author 😀
• Jeffrey Arulraj
nareshkumar6539
We 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
But this method is not suited for adding 12EF+ABCD Well the complexity increases here
• Prashanth Raj
yeah i was forced to byheart ...........
we were having special periods for tables and abacus calculations...............
• Nayan Goenka
I 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 😛)
• rahul69
Abhishek Rawal
Let'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.
I 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.
For understanding it, let us take an example:
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 : 24-6=18
as 18<20 Hence 18 is the answer, ie E+A = 18
• Nayan Goenka
rahul69
I 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.
For understanding it, let us take an example:

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 : 24-6=18
as 18<20 Hence 18 is the answer, ie E+A = 18

Are you trying to do BCD addition?
• rahul69
Nayan Goenka
Are you trying to do BCD addition?
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 😁
• kheerthi chandru
till 12 is only possible fr me.. but i did not find any need to by heart after tat..
i am comfortable with 12😉

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