Help please Y6 fraction ordering

[BlazingBlaster]

Have a headache.

Could you help.

I’m getting the lowest common denominator as 240? Is this the easiest way of working this out and then multiplying the numerator. Seems a huge number to fathom. The first and the fourth are one whole and the fraction.

Would you also change all to mixed or all to improper?

1 2/3. 7/4. 17/10. 1 5/8.

7/4, 17/10, 1, 2/3, 5/8

Sorry. I missed the 1 and 5/8 and interpreted it as 5/8.

Sorry, there’s four fractions in total

1 2/3
7/4
17/10
1 5/8

Which method did you use to work this out MUM?

I think 120 is the LCD?

LCD is 120.

3, x 2^3 x 5 = 120. And compare, I think.

I’m such a maths phonic and this gives me a real headache

1 2/3 = 5/3 = 1.666667
7/4 = 1.75
17/10 = 1.7
13/8 = 1.625

I’ve been looking at it for so long, of course it’s 120.

Seems a huge number to fathom

Convert to decimal, they're all easy to do that to in your head aren't they?

1.6...
1.7
1.75
1.625

And of course I meant phobic!

MUM, thanks, decimal is the other option I looked at to try and find the answer.

SirFred, I look at numbers on a page and they just start jumbling up. Awful I know.

It's easy to prime factorise each denominator to find LCD, but just multiplying everything to find common denominator works totally fine as well.
So 240 is still a good way to do it imo.

120 is LCD. So

195/120 (1 5/8)
200/120 (1 2/3)
204/120 (17/10)
210/120 (7/4)

Thanks Irvine, I last worked out things like this in the 80’s. Shows doesn’t it

It’s not awful, y6 maths is hard when you’re out of practice.
I think they would expect you covert them to the lowest common denominator and order them as improper fractions and then change them back to the original.
So 1 2/3 = 200/120
7/4= 210/120
17/10= 204/120
13/8= 195/120.

Thanks OhCrepe.

I try and work look through homework so I can confidentially help dc if needs be. They don’t know I do this Mum is maths expert if they ask.

Don’t think I’ll be able to keep this up for much longer.

ha ha yes it’s at a different level than in our day (80s too for me). I’m a teacher so I’ve revisited the curriculum frequently but I still need to remind myself of the expected methods sometimes.
There are some great YouTube maths tutors you could check out when it gets even more tricky.