Hi, Are you saying that you don't understand some of those sentences? Which ones? Why don't you write some sentences yourself and post them here.
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CliveHi,
There's no rule, just suggestions for style. Here, I'd write the number '25'.
Best wishes, Clive
There are rules. I don't agree with all of them.
1. Write out the numbers up to nine, unless there are other numbers written as numerals. There are nine cats. There were 25 cats but now there are only 9.
2. Numbers