Or search by topic
|speed||relative to average|
|third hour||70||60 + 10|
|etc.||70||60 + 10|
An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.
Choose any three by three square of dates on a calendar page...
Investigate how you can work out what day of the week your birthday will be on next year, and the year after...