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The thing is, I am very ambitious for my children, and want an excellent education for them, but I know that homework is not the most effective way to get this.
I can't find all the sources to quote it, but I remember a study which looked at creative story writing. They looked at various links, one was early writers/readers and another was early years lots of imaginative play.
They found that early reading made no difference to the ability to write aged 7/8, but that exposure to lots of free imaginative play did make a very positive difference to their creative writing skills aged 7/8. So if you want your child to be a goo writer, get them to play more!
Homework such as worksheets and making sentences from spelling words are not the most effective way to produce children who can achieve academically.
The homework = good education, or homework = better achievement is a false link (again I am talking about primary, especially KS1)
exposure to wide range of experiences and lots and lots of interesting stories and vocabulary is the most important thing you can give them. Given a choice between learning spellings, or reading aloud the next chapter of 'The Lion the Witch and the Wardrobe' to my 5 yo I would rather read aloud.
I also remember being taught that younger children need to alternate their large motor activity with fine motor activity, so, sending all the kids outside to run around for 15 minutes, and then asking them to sit down and do some writing, produces much better writing, than lots of repetitive practice.
On the same note, a child with poor writing skills, poor letter formation, etc has poor fine motor skills. You can make them do 2 sheets of handwriting practice per night, or you can do all the other things that help improve fine motor skills, eg lego building, rolling playdough balls etc etc.
I could weep at times for the way in which play is so misunderstood in our society now. We actually understood this better in the early 70s.