Another maths query

[Creole]

Hi guys,

How can you explain to a 6 yr old (yr2) what is half of 90 or 37?

Obviously, I know the answer but how can I show my ds how to do this in a non-long winded way?

thanks

I think you're looking at doubles or near doubles. So ask her what half of 100 is (50) then the difference between 100 and 90 is and halve that(5) - answer is 50-5

So how would you do half of 37 then?

Sorry

or...half of ten (ie 5) x however many tens + half of whats left
so 90 = 5 x 9 = 45
and 37 = 5 x 3 + half of 7 (which you can share out ie, one one, two two, three three, oh an odd one thats a half - so 3 and a half) = 18.5

So 6yr olds are expected to do this?? Goodness!

no idea, I have a 5yo (reception) so I don't know what he would be doing in a couple of years. I was just making a suggestion as I was assuming they would know 5 times table by then, and ds would get the half of a number upto 10 bit, so I thought that would work.

No, I wasn't questioning you, just shocked that they are expected to know this at this age.
But yes, they are doing their 2,5,10,3 & 4 times tables

as I said, I have no idea - was just trying a suggestion.
If they are doing their 5 times tables then my 5 x plus half the remainder would work, and reinforce the 5 times table.
Best bet is probably to ask the teacher how they are teahcing it so that you can help your ds to understand - I am sure they would be happy to explain.

thanks

let us know what they say!

Oh dear I would just say divide by 2 using normal division.

Half of 30 (15)
Half of nearest number to 7 ie 6 (3) or 8 (4)
Half of diffenrce ie 1 is 1/2
15+3+1/2 = 18 1/2
btw I seriously doubt my Yr2 could do it.

that's the thing are yr2s expected to know this?

I think in this case you need to follow how it is explained at school. They could be learning it through fractions or all sorts of either ways. Some have reminders i.e half of 37 is 18 reminder 1 (rather than 18.5). The problem is that the link between division, multiplication and fractions is a crucial one in maths but there is lots to understand

Agree with witchandchips. Find out how they are doing this in school. It could be halving and doubling. It could be an intro to division.

And buy a big box of poker chips. We use them all the time. A lot of children find this sort of problem easier if there's something they can touch and see to work it out with.

Crikey, DS (yr3) is supposed to be one of the top 3 maths pupils in his class, and he is only just starting to get tough problems like division with remainders. He was asked to divide 34 by 8 the other day, and I for one was well-impressed that he could get it right. Go ask the teacher how they teach it, Creole, only way to go. Sounds completely unfair and unnec to teach this soon, imho. DS didn't get onto times-tables until about March-April of Yr2.

second poker chips