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?
The ten digits of a digital clock are shown below.
I have a $12$ hour digital clock which shows the time, using four digits, on a piece of glass, so it can be seen from both sides. At what time between $3$ o'clock and $10$ o'clock does the time look the same from both sides?
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.
This problem is taken from the UKMT Mathematical Challenges.