An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.
What is the smallest number with exactly 14 divisors?
Many numbers can be expressed as the sum of two or more consecutive integers. For example, 15=7+8 and 10=1+2+3+4. Can you say which numbers can be expressed in this way?
Each pentagon has a turn of 36o to pack against its
Therefore it will take 10 (x36o) turns to complete a
full-turn, i.e. 10 pentagons
Therefore 7 more pentagons are needed.
This problem is taken from the UKMT Mathematical Challenges.