1 out of 3
Can you find any two-digit numbers that satisfy all of these statements?
1 out of 3
Trinni rearranges numbers on a clock face so each adjacent pair add up to a triangle number... What number did she put where 6 would usually be?
2 out of 3
I have forgotten the number of the combination of the lock on my briefcase. I did have a method for remembering it...
2 out of 3
Can you find an efficient method to work out how many handshakes there would be if hundreds of people met?
1 out of 3
Can you find a rule which connects consecutive triangular numbers?
2 out of 3
Can you find a rule which relates triangular numbers to square numbers?
3 out of 3
Let S1 = 1 , S2 = 2 + 3, S3 = 4 + 5 + 6 ,........ Calculate S17.
3 out of 3
Show that all pentagonal numbers are one third of a triangular number.
1 out of 3
Watch the video to see how to add together an arithmetic sequence of numbers efficiently.
What would you do if your teacher asked you add all the numbers from 1 to 100? Find out how Carl Gauss responded when he was asked to do just that.
