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1, 2, 3, ... 10, 20, 30, ... Which is quicker, counting up to $30$ in ones or counting up to $300$ in tens? Why?
Which is quicker, counting up to $40$ in ones or counting up to $4,000$ in hundreds?

Which is quicker, counting up to $10$ in ones or counting up to $1,000,000$ in hundred-thousands?

Which is quicker, counting up to $20$ in ones or counting up to $140$ in sevens?

Which is quicker, counting up to $25$ in French or in English?

Maybe you could work on this with a partner!
When you have timed yourselves and decided about the reasons for your results, you could invent some other examples for yourselves.
You could predict which was going to be quicker and then try them out to test your prediction.