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## Anyone able to do KS3 maths?!

(36 Posts)
anchovies Thu 26-Sep-13 19:42:50

In this addition each letter stands for a different digit, with S standing for 3. What is the value of Y x O?

S O
+ M A N Y
S U M S

Sorry can't get it to format properly, obviously the SO should be above the NY and the SUMS directly underneath the MANY if that makes any sense!

SPBisResisting Thu 26-Sep-13 19:44:21

Well you know O + Y =S
so one of them is one and one two

anchovies Thu 26-Sep-13 19:46:02

Holy moly I cannot believe I couldn't figure that out!!! The humiliation I think I'm going to have to report my own thread on the basis of general stupidity!

Iwaswatchingthat Thu 26-Sep-13 19:46:22

2?

RosesInTheRain Thu 26-Sep-13 19:48:27

but O and Y could be e.g. 8+5 which gives you a 'carried ten'
(says DH who was a maths teacher)

he is working on it now!

stringornothing Thu 26-Sep-13 19:51:23

Actually I'm not sure that's right. I reckon O and Y add up to 13, not 3. Surely M must be 2, and is A 9?

Thu 26-Sep-13 19:53:44

U is 0, M is 2, S is 3, O is 6 (or 7), Y is 7 (or 6), N is 8, A is 9.

anchovies Thu 26-Sep-13 19:54:05

I don't know, I was trying to do something very complicated but the 1x2 answer makes much more sense when it is aimed at 11-13 year olds?!

anchovies Thu 26-Sep-13 19:56:00

ThreeBeeOneGee that's where I was headed but they are supposed to be able to solve this themselves (along with another question) in 10 minutes?

TaudrieTattoo Thu 26-Sep-13 19:56:36

Oh God, not you as well.

Good luck

Thu 26-Sep-13 19:57:09

I worked out M first, then O+Y must be 13, but I couldn't use 5+8 as I needed N to be 8 (so that 1 carried plus 3 plus N would be 12) and I couldn't use 4+9 as I needed A to be 9 (so that 1 carried plus A would be 10).

ClayDavis Thu 26-Sep-13 19:58:41

42 I think. 6 * 7

Thu 26-Sep-13 20:00:23

Sorry, I'm good at solving puzzles quickly but terrible at trying to explain my methods to others. Good thing I'm not a teacher!

ClayDavis Thu 26-Sep-13 20:00:49

Ha, ha. Should have refreshed the page.

TheBuskersDog Thu 26-Sep-13 20:01:26

Yes Y x O =42

sydlexic Thu 26-Sep-13 20:02:35

It is 9

RosesInTheRain Thu 26-Sep-13 20:03:30

Husband typing this one:

The 3 on the end is a bear-trap. The trick is to spot that you have an answer which is '3000 and something' when you add a number between 30 and 39 to another 4-digit number. The first digit of the four digit number (M) cannot be 3 as well, since this is S. So "MANY" must be 2900 and something. That gives you M and A. And you then spot that U must be 0 because there's no way it could be anything bigger.

So now we have SUMS = 3023, MANY = 29NY and SO = 3O

Because 2 has been used, you know that the O + Y is one of the options with a carry (4+9, 5+8, 6+7). Put the carry under the 2 of 3023 and you see that N=8.

Having used 8 and 9 now the only combination left for O + Y is 6 + 7.

You can't say for certain which way round these go, hence the question asks for the product, 42 (the answer to the ultimate question of life, the universe and everything, of course!).

stringornothing Thu 26-Sep-13 20:04:22

I'm with three - it's not tricky if you work logically from the left - M can only be 2, and thus A must be 9 and U must be 0 and then Three's working for the other four numbers.

stringornothing Thu 26-Sep-13 20:06:39

Very impressed with roses' husband's explanation. What school do you teach at? Can I send DS there?

anchovies Thu 26-Sep-13 20:09:01

Does anyone fancy trying to get a group of mixed ability 12 year olds to the answer 42 in 5 minutes for me?! Bear in mind the other question is:

The year 2004 has the units digit equal to twice the thousands digit.
Which year will it be when this next happens?

Talk about one extreme to another!

anchovies Thu 26-Sep-13 20:09:54

Haha don't send your ds to my school then string! Fortunately I'm not a maths teacher!

anchovies Thu 26-Sep-13 20:11:11

Roses does he reckon they've cocked up the question using a word with another M in it?

anchovies Thu 26-Sep-13 20:12:27

Sorry I meant S not M

ClayDavis Thu 26-Sep-13 20:14:08

Not particularly anchovies. I sort of used threes method, starting with the M=2 but not working left to right and substituting letters for numbers as I worked them out.

Is that year question as simple as it looks or am I missing something obvious.

RosesInTheRain Thu 26-Sep-13 20:15:39

no... says it's deliberate so you realise there are several ways of getting 3 on the end.

He doesn't teach any more- works for an exam board instead! The maths dept at my school hasn't been the same since ;)

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