Dodo76:
My first piece of advice is talk to parents with children in other years - perhaps some of your DC's friends have siblings further up in the school. Find out from them how things progress - or if they're doing extra at home. You may be reassured that things gradually pick up over Y1 and from Y2 there's a steady stream of homework coming home.
It's very tricky not knowing your precise situation - but if you're worried there are resources out there.
First port of call for early reading/ maths would be OXFORD OWL (from Oxford University Press): www.oxfordowl.co.uk/for-home
Our school's homework was highly skewed to reading with little or no written work & rarely any actual maths work in YR through Y2. So we opted to use an on-line maths tutorial. This is a subscription service - but in our case with a school with a very poor approach to maths tuition - this was a solution to some fairly deep problems in tuition & practice for maths (a subject we as parents value).
There's lots out there -
Mathsfactor: www.themathsfactor.com/
Maths Whizz: www.whizz.com/
Mathletics: www.mathletics.co.uk/
Komodo Maths: komodomath.com/
Khan Academy (this picks up from 3rd Grade US curriculum = Y2 England) & is free. www.khanacademy.org/ - on black menu bar select LEARN and then select MATH.
There are also a ton of workbooks out there - any bookstore/ large newsagents will have a wide selection.
Either way you go (workbook/ computer tutorial) include your child in the decision - let them chose the book/ computer tutorial that appeals to them.
We've been using mathsfactor since Y2 - doing about 5 x 10 - 20 minute homeworks a week (usually 3 in the week done whilst I'm cooking or whilst waiting for a sibling to have their bath/ 2 at the weekend). Our solution has been little and often and stressing that core calculation skills are soundly understood. Given DD1 was in serious trouble with maths leaving KS1 on NC L1 for Maths on KS1 SATs - we were convinced something needed to be done and although we'd approached the school for help, they said it was not necessary. So from late Y2 to late Y5 DD1 used arithmetic school and since start Y6 DD1 has been using algebra school. She adores maths, responds well to video explanations of how to do things (she's very visual) and enjoys the gaming approach to learning/ practicing maths skills. She's gone from bottom table to top table and is apparently on track for L6 in maths. We're thrilled for her but also know that many who were streets ahead of her in maths at Y2 are now struggling in Y6 to achieve a L4 - which really does have to be down to the school's approach to maths tuition/ practice.
You'll know your situation - and you'll know what areas of curriculum concern you.
With reading, do what little the school provides - but don't limit yourselves to that. You don't have to read the school book every night - especially if your child can read it well. Read old favourites, read to your child from books s/he might enjoy but possibly don't quite have the skills yet to read for themselves, go the local library, trade books with friends, etc...
With writing - well box clever. Encourage postcards from holidays, have them send thank you cards for gifts. Have them write off to enter a competition. Have them write to their favourite TV character/ star. Encourage diaries. Have them draw cartoons. etc....
Our situation is that we have a school which feels strongly homework is of no value. I personally see homework as a form of practice - much as you need to practice a sport or instrument to get good or go to regular lessons in music/ dance to learn new skills. I think investing time in these early skills - not overkill - but 30 minutes here and there a day (bit of reading, bit of a maths worksheet/ game, etc...) adds up to better performance as a student.
My kids still play, colour, read for pleasure, watch far too much tv and play video games galore. They're still kids - but I just steadily ensure that day by day a little is done to help them because I sincerely have serious doubts about the school. It's very much a school where there's a serious undercurrent against study/ academic achievement - not just from some children - but from the staff.
Everyone's situation is different of course - but in our case, with a school totally uninterested in helping my DD1 when she couldn't read or do more than add to 20 at end Y2 - we've opted to do more ourselves and we've never regretted it.