In not being able to do my 10 year olds math homework!

[Livesforbedtime]

I don't understand this.. She has to work out 23 x 22..

Now I'm not the sharpest pencil in the box, but I have a degree and a responsible job... So WHY when I worked it out as:

20 x 20 = 400
2 x 3 = 6

Answer = 406

But it's not is it? It's 506.. But I don't understand why

My poor 10 year old DD is bewildered.. And I cannot understand why I'm wrong yet I know I am!

I suspect it have a mind block... Yes that's it.. I'm not truly stupid ok I might be..

It doesn't make sense!

[welshnat]

It's 23 x 20 + 23 x 2 = 506

[welshnat]

It is an easy mistake to make though. I had to think twice

[DarlingGrace]

Because you dont work it out old school LMAO

23 X
22
460
46
506

[Lovecat]

It's 23 lots of 22, though, so your way makes no sense at all...

Is that how the school have asked them to do it??

[Cuxibamba]

Wouldn't you do 20x22= 440
3x22=66?

[TheWomanWithTheMysteriousLump]

You have to multiply the two 20s by the 2 and the 3 as well.
2020
+220
+320
+23
=506

[Cuxibamba]

Then add them together.

[startwig1982]

It's because you need to do:
20 x 20
20 x 2
3 x 20
2 x 3
You must multiply all the bits together.
Most children learn by grid method where you split the numbers into tens and units, therefore having 4 sums that you add up at the end.

[LIZS]

20x20= 400
20x2=40
3x22=66
total 506

[Livesforbedtime]

Oh god so I am stupid?!

It's just made sense now. Honestly I was so adamant I was right! My poor DD is now more confused than when she started!

Must learn to just leave well alone!

[Primrose123]

Think of it more as

20 x 22 and 3 x 22

which would be

440 and 66 = 506

Using your method, you also have to do 20x2 and 3x20. Does that make sense?

[Livesforbedtime]

Ohhh that makes much more sense!!

[Logg1e]

If you can't do 23 lots of 22, can you do...
2 lots of 22?
4 lots of 22?
10 lots of 22?
20 lots of 22?
And so on.
Can you use these facts to get to 23 lots of 22?

[verytellytubby]

I can't do my twins year 4 maths. My DD's year 7 maths is beyond me. I learnt Smile maths at my comp and it has a lot to answer for!!!

[Ubik1]

My DD aged 9 has now surpassed my levels of arithmetic , only DP with his superior Scottish education can help her - although he told me the other day that he has 'forgotten all my trigonometry'

I did statistics as part if my degree and it all made sense to me but adding, subtractionabd long division? Nah.

[Laurasmile]

Unsure of what multiplication method she'll have learnt at school - but the grid method for multiplication gets taught at secondary and helps avoid making that mistake -

[Ubik1]

Oh we did Smile maths as well - basically you left school being able to draw nice pictures but no idea how to actually calculate anything. Can draw a great pie chart though. Never learnt my times tables either.

[Livesforbedtime]

Oh see now this is more like it.. Feel much better now I too can do an almost bar chart.. It's a work of art really...

[Livesforbedtime]

awesome

[Ubik1]

It was really important to choose nice complementary colours and colour in carefully. New felt tips made it extra special

[BikeRunSki]

I did a Smile Maths, went on to do A level Maths and a Physics degree!

[BorisJohnsonsHair]

YABU to call it math though.

[Livesforbedtime]

MathS honestly you people that deliberately correct people constantly really bloody irritate me.

I didn't ask for a grammer/spell check and I really dislike the snidey 'ooh look what I found.. A mistake!

Do you guys have any idea how absolutely childlike and pedantic you come across to average normal people?

[RedPencils]

DS1 left me behind in Year 4. He is frighteningly good at mental arithmetic and times tables. I'm shocking!
I've been known to sneak a look on the calculator on my phone, under the guise of checking a text message to check the answers.