Re: Learning time table by the age of 11
well it will work that way as the brain has then learnt behaviour over the course of time such as performing simple calculations up to 12x, so it has what it needs to go beyond that, to transfer to more difficult areas. If you can do 12 x 9 in your head, you can do 29 x 15 (approx. 30x15) quite easily, ie 3x15 is 45, adding zero is 450, - 15 (not forgetting the original 15).. gives your answer. It's more difficult if use numbers such as 44 x 86. The higher the values are however more easier to calculate, ie 19, 18, 28, 29, 49, 78. The more difficult ones require good memory to calculate in your head.
Originally posted by Fred
View Post



well 11 as I can add 9 to 90 lol ) on my fingers, up to 6 times table is okay then I start getting confuddled. I seem to have a learnt a weird way of rounding up then subtracting the lower value multiplication result from the main result - must have been some whacky 70's experiment which failed because although I did well in Maths at school and exams etc, the basics of standing in a shop working out how many 67p items I can get for a tenner takes me a while....( so I know I can get 10 because that's £6.70 - but there I'd have to add 70p on and take a penny off a few times until I'm near £10 and that would involve fingers ) 

Comment