Reply to: Magic

[TimberWolf]

Fortunately, I did, which is a great relief seeing as this is the alternative.

Amusing imagining you break your 3 minute record for multiplying 6 by 7

The one for the days in the month on your knuckles is useful. Much better than that rhyme that I can never remember.

[dang65]

Or you could have invested some time when you were 7 learning your times tables.

Fortunately, I did, which is a great relief seeing as this is the alternative.

[xoggoth]

The magazine does explain it, as some bright sorts have pointed out. Prefer magic myself.

It also says that anyone who got

Aard-Vark in Bolivia eating Kiwi Fruit

is an unstable psychotic and should be locked up before he/she kills somebody.

[NotAllThere]

There's one here that does not only 7 but, 6,7,8,9,10 on the fingers too, for multiplying integers >=6 and <=10.

Or you could have invested some time when you were 7 learning your times tables.

Alternatively, for multiplying by 7, double the number and add half to the tens figure. And add 5 if the original digit was odd.
so 8 * 7 = 16 + 40 = 56, 7 * 7 = 14 + 30 + 5, 123 * 7 = feck it, you do it.

...and that one's completely done my head in.

Adding half the number to tens figure is the same as multiplying by five. As you're doing integer arithmetic, if the number is odd, then you need to add another five after you've done this. Then, you add on twice the original number.

I.e., you're just doing 2x + 10x/2 = 2x + 5x = 7x

[dang65]

There's one here that does not only 7 but, 6,7,8,9,10 on the fingers too, for multiplying integers >=6 and <=10.

That's clever! Trouble is, it requires a bit of mental agility to do it with any speed (I'm up to 3 minutes per calculation now, after a bit of practise).

Alternatively, for multiplying by 7, double the number and add half to the tens figure. And add 5 if the original digit was odd.
so 8 * 7 = 16 + 40 = 56, 7 * 7 = 14 + 30 + 5, 123 * 7 = feck it, you do it.

...and that one's completely done my head in.

[Le Rosbif]

sasguru in Germany eating a rutabaga

[Lockhouse]

Gok Wan?

[TimberWolf]

I lost, I couldn't think of a fruit beginning with W.

Gok Wan?

[Doggy Styles]

I lost, I couldn't think of a fruit beginning with W.

That was from cow. Which came from Dominican Republic (I only thought of that because I work with a ballet dancer from there, Denmark would have been better).

[TimberWolf]

That's the old 9 times table trick...

Hold out ten fingers

||||||||||

Tuck in the finger at the position you want to multiply by nine

e.g. For 3 x 9 tuck in 3rd finger

||.|||||||

2 on the left and 7 on the right

Now, has anyone got a cheat for the 7 times table?

There's one here that does not only 7 but, 6,7,8,9,10 on the fingers too, for multiplying integers >=6 and <=10.

Alternatively, for multiplying by 7, double the number and add half to the tens figure. And add 5 if the original digit was odd.
so 8 * 7 = 16 + 40 = 56, 7 * 7 = 14 + 30 + 5, 123 * 7 = feck it, you do it.

[Churchill]

That's the old 9 times table trick...

Hold out ten fingers

||||||||||

Tuck in the finger at the position you want to multiply by nine

e.g. For 3 x 9 tuck in 3rd finger

||.|||||||

2 on the left and 7 on the right

Now, has anyone got a cheat for the 7 times table?

DodgyAgent but then again he has six fingers on each hand.

[dang65]

any integer (1 to 10) multiplied by 9 and digits are summed will produce 9

That's the old 9 times table trick...

Hold out ten fingers

||||||||||

Tuck in the finger at the position you want to multiply by nine

e.g. For 3 x 9 tuck in 3rd finger

||.|||||||

2 on the left and 7 on the right

Now, has anyone got a cheat for the 7 times table?

[Bunk]

It wouldn't have worked for me either had I gone with Deutschland, which was my first guess that was immediately rejected and replaced by Denmark.

I did think I might be cheating with Deutschland but it was the first thing that popped into my head. Then I switched back to English for dog and grapefruit.

[milanbenes]

Yep, apple.

The most interesting bit may be after instruction 4 because any integer (1 to 10) multiplied by 9 and digits are summed will produce 9, so you always get 'd' as the first letter.

ahhhh

that's my mistake I added a few more digets to the number

ok I try again...

ok still works out the same

cockatoo in the dominican republic eating an olive

Milan.

[MrRobin]

Hmmm - mines was an Aard-Vark in Bolivia eating Kiwi Fruit

Got amy more for us Xoggoth ?

MATHS FAIL

The trick is that whatever number you choose at the beginning, you will always end up with a country beginning with D