Dinosaur egg laying challenge

3 dinosaurs laid some eggs. They laid 19 altogether. How many did they each lay?

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A book challenge here. How accurately can you guess the number of pages in books?

This challenge is to find as many ways as possible of making 12 using three number cards and the add, subtract and multiply signs.

A development of the 'Caterpillar investigation' but using multiples of 10. Great for practising addition.

How many ways can three runners cover a distance of 19 miles? They all have to run an odd number of miles.