#9

Dr Lagina’s Math tutorial√24/√3 = √(24/3) = √8= √(4.2) = √4√2 = 2√2√(81/25) = √81/√25 = 9/5MOZDetentionBramm SBlake FMortyHailey YJordan AKara BMathematics – A-level standard.These are some good examples of operations with surds, using the rules for both multiplication (n√(a.b) = n√a.n√b) and division (n√(a/b) = n√a/n√b). All the working is correct. The sloppy square root sign in the second

Read more »

Break Time!

Just to say that there will be a short break from lessons whilst we at Blackboards in Porn Towers stop looking at pornography for long enough to move to bigger premises. In the meantime, please do browse the archives.Thank you to everyone for your comments and for sending in so many great images of blackboards in porn. We have been deluged with a shedload* of pornography, but hope to get

Read more »

#8

Mary Had A Little Lamb- ½ beat- 1 beat- 2 beatsMusic – introductory levelThe treble clefs have been beautifully drawn, but there is no hiding some fundamental errors on this blackboard.Firstly, the time signature is written as both ‘4/4’ and ‘c’. This is tautologous as ‘c’ means common time (4/4), so just one of these will do. Also, there is no need to put the time signature on every line

Read more »

#7

1. S=0 A=02. S=1/4 A=1/163. S=1/2 A=1/44. S=1 A=15. S=2 A=46. S=3 A=9Mathematicst pmn3/4 02/5100=S=AAS 42/A9Mathematics - year 8 levelThis sets out to be a good illustration of the function more commonly expressed as y=x2. (Why the teacher has chosen A and S is unclear; these are sometimes used in lower case form as acceleration and distance respectively, but the relationship between them would

Read more »

#6

H2N2O2(HO-N=N-OH)+H4SIO4(SI(OH)4)H2O + H2OSO4H3PO3(HPO(OH2))H2SO4 => SO4H2OSO4 = HChemistry – A-level/undergraduate levelThis is a frustratingly inconsistent approach to writing chemical formulae. On the one hand the teacher has gone to the trouble of also using structural formulae to improve clarity (eg H2N2O2 could be nitramide, but the addition of HO-N=N-OH makes it clear that we

Read more »

#5

AFTER SCHOOL:- math1 + 1 = 21*