7 Brides for 7 Brothers (I guessed this one might be in and went looking for it!) 
1 Horn on a Unicorn (not sure about that one)
100 Years in a Century
25 Prime Numbers under 100
180 Degrees in a Triangle
21 the Key to the Door
999 Emergency!
32 is the Temperature in Degrees Fahrenheit at which Water Freezes
621 Height of Snaefell (Metres)
A the W in 80 D (by J V)
Around the World in 80 Days (by Jules Verne)
850 Height of Slieve Donard (Metres)
1345 Height of Ben Nevis (meters)
1760 Yards in a Mile
978 Height of Scafell Pike (Metres)
Wrong. IEEE 1541-2002 is the standard for multiplicative prefices.
For once Wiki is correct
In 1998, the International Bureau of Weights and Measures (BIPM), one of the organizations that maintain SI, published a brochure stating, among other things, that SI prefixes strictly refer to powers of ten and should not be used to indicate binary multiples, using as an example that 1 kilobit is 1000 bits and not 1024 bits.
The binary prefixes have been adopted by the European Committee for Electrotechnical Standardization (CENELEC) as the harmonization document HD 60027-2:2003-03.[2] Adherence to this standard implies that binary prefixes wouldh be used for powers of two and SI prefixes for powers of ten. This document has been adopted as a European standard.
The IEC binary prefixes (kibi, mebi ...) are gaining acceptance in open source software and in scientific literature. Elsewhere adoption has been slow, with some operating systems, most notably Windows, continuing to use SI prefixes (kilo, mega ...) for binary multiples.
Supporters of IEEE 1541 emphasize that the standard solves the confusion of units in the market place. Some software (most notably free and open source) uses the decimal SI prefixes and binary prefixes according to the standard.
M1EYP: So that standard came in in 1998? And that invalidates what I learned at school in 1982? Maybe another standard will come in that says the moon landings were faked?
30 Days hath September, April, June and November… (right, bed time, wonder how many will have gone by the time I look again!) PS Great game by the way… might play it at work on Friday, you know, that day you take in the board games… or was that school?? 
7 Days of the Week
1812 Overture by Tchaikovsky
29 Days in February in a Leap Year
60 Minutes in a Hour