Conquer Club

You will need:
1. two hands
2. five fingers on each hand.

with your palms facing towards you and all fingers sticking out, count across your fingers the number you want to multiply by nine and curl that finger into your palm. to the left of the finger are the tens, to the right are the singles.

for example.

3x9 (which equals 27 btw)

Curl into palm middle finger (3rd finger across from left hand side) of left hand.
To the left of your middle finger you have your thumb and index finger (2) and to the right you have 7 fingers.

I learned this when I was 7






And I still use it

I thought I'd spread something useful around for a change

Make a fist with both hands facing down, then put the knuckles of your index fingers together. Working across your knuckles from left to right, counting both the peaks and the troughs, with the knuckle of your left little finger January, the troughs beside February, the next knuckle March and so on you can see which months have 31 days (the peaks) and which have less (the troughs).

NOTE: You don't count the gap between your index fingers ie. July - August

Neat. Wish I'd learned this rather than having times tables tattooed onto my cerebellum.

The1exile wrote:Neat. Wish I'd learned this rather than having times tables tattooed onto my cerebellum.

Quite. I will never be able to forget everything from 1x1 to 12x12. Oh, all that pain...

cool perdro....my mom taught me esentially the same thing but not as neat The 1st digit in the answeris 1 LESS than the multiplyer and the 2nd is the diff between multiplier and 10.....both my kids used that ;o)

Yeah, I saw that movie too..

How about this one that I JUST learned: When setting a table, hold your hands in front of you. Touch you index finger to your thumb (like an ok sign). Now you have a b on the left and a d on the right. B-bread plate and d=drinks. I thought that was pretty cool.

I have them pretty well memorized and that's the way I like it... While learning them, the trick I taught myself was that for all the multiples of 9 from 1-10, the digits add up to 9, and the first number was just what you were multiplying it by minus 1. So, for example, 9*9, the first number is 8 (9-1) and the second number is 1, because 8+1=9. I don't think I did too bad for myself, coming up with that when I was 7...

Bertros Bertros wrote:Make a fist with both hands facing down, then put the knuckles of your index fingers together. Working across your knuckles from left to right, counting both the peaks and the troughs, with the knuckle of your left little finger January, the troughs beside February, the next knuckle March and so on you can see which months have 31 days (the peaks) and which have less (the troughs).

NOTE: You don't count the gap between your index fingers ie. July - August

Another way to remember this (if you're a music theory geek) is to think of the lydian mode of the C major scale on a piano - that is, the white keys from F up to E represent the months with 31 days. Then the black keys from F# to D# are the months that have less.

I got a calculator! What use is learning it?

Snorri1234 wrote:I got a calculator! What use is learning it?

They're slow and inaccurate.

hecter wrote:

Snorri1234 wrote:I got a calculator! What use is learning it?

They're slow and inaccurate.

Well yeah, but brains also have some positives.

Snorri1234 wrote:

hecter wrote:

Snorri1234 wrote:I got a calculator! What use is learning it?

They're slow and inaccurate.

Well yeah, but brains also have some positives.

Calculators have positives and negatives too.


PS. Hecter, everybody learns that trick...

90=9*10
81=9*9
72=9*8
63=9*7
54=9*6
45=9*5
36=9*4
27=9*3
18=9*2
09=9*1

This is how I learned it :p

Other than it just becoming memorized as a by-product of figuring it out so many times, I would use simple arithmetic...

9 * x = (10 - 1) * x = 10x - x

10 multiplied by x should be very easy.

That product minus x should be very easy.

As an example, 35 x 9 = 350 - 35 = 315 is very easy IMHO.

But I wouldn't memorize this for just 9's...it is just a simple technique that I would decide to use when a problem presented itself...I will use different arithmetic/algebraic techniques/properties for different equations depending on what I think of for any given situation.

or you could've just memorized it when you were really young and not have to rely on timetaking methods

StiffMittens wrote:

Bertros Bertros wrote:Make a fist with both hands facing down, then put the knuckles of your index fingers together. Working across your knuckles from left to right, counting both the peaks and the troughs, with the knuckle of your left little finger January, the troughs beside February, the next knuckle March and so on you can see which months have 31 days (the peaks) and which have less (the troughs).

NOTE: You don't count the gap between your index fingers ie. July - August

Another way to remember this (if you're a music theory geek) is to think of the lydian mode of the C major scale on a piano - that is, the white keys from F up to E represent the months with 31 days. Then the black keys from F# to D# are the months that have less.

My music teacher taught me this one the other day.
It's gonna get me into music school!

not really