You may also like

problem icon

Month Mania

Can you design a new shape for the twenty-eight squares and arrange the numbers in a logical way? What patterns do you notice?

problem icon


In a square in which the houses are evenly spaced, numbers 3 and 10 are opposite each other. What is the smallest and what is the largest possible number of houses in the square?

problem icon

Page Numbers

Exactly 195 digits have been used to number the pages in a book. How many pages does the book have?

Alien Counting

Stage: 2 Challenge Level: Challenge Level:2 Challenge Level:2

It's useful to recall that we humans use 10 as our source for counting and our columns for writing are Units, Tens, Hundreds, Thousands etc.
Th H T U

So saying 1234 as one Thousand two Hundred and Thirty Four could - more clumsily - be said as
one (ten lots of ten lots of ten) 2 (ten lots of ten) 3 (tens) and 4.
Looking at this practically here we have a heap of red dots and you see how they would be grouped to be counted, firstly in human 10's and then in Senda 6's.