Free maths worksheets from mathsblog.co.uk
Counting in tens might seem easy, especially by year 4.
However, there are many children who do find difficulties, especially when crossing the hundreds and thousands boundaries. One such difficulty might show itself if asked to write down ten more than 1097, which is 1107 or ten more than 2896 which is 2906.
Even harder might be ten less than 4006, which is 3996.
Don’t take it for granted that your children can do this as a really good understanding of place value is needed.