Consecutive Numbers

An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.

I'm Eight

Find a great variety of ways of asking questions which make 8.

Calendar Capers

Choose any three by three square of dates on a calendar page...

Calculation 2000

Stage: 3 Short Challenge Level:
$4,000,000$

$$2000+1999\times2000=(1+1999) \times 2000= 2000 \times 2000=4000000$$

This problem is taken from the UKMT Mathematical Challenges.