A&B Computing


Multiply And Divide

Author: Dave Reeder
Publisher: Cottage
Machine: BBC Model A & B

 
Published in A&B Computing 1.05

Multiply And Divide

Both these programs are of the same standard and quality of Add & Subtract - Full use being made of Double Height characters and the change of colour on the column being worked. Again there is a choice of easy and hard division with a further option of selecting 2 or 5 questions.

Having been given the sum, divide 71056 by 267... the first three figures '710' colours Yellow and, the 267 turns Green; i.e. Yellow divided by Green. The user is now encouraged to 'Guesstiimate' how many 267s there are in 710, three wrong guesses are permissable after which a wrong guess is recorded as an error. On inputing the answer '2' 267 is multiplied by 2 again with full use of colour, i.e. Red X Green. The answer of 534 is printed under the 701, subtraction takes place followed by the '5' moving down visually and, again division starts with further 'Guesstimation' i.e. 675 divided 267. Encouragement is continuous and, with 5 correct out of 5 the reward is a game of Hangman but, Hangman with a difference. The child has to find the name of one of many famous mathematicians, and this before he is hung; and before he/she uses up his ten guesses.

In 'multiplication' the set up is much the same as to 2 X 7 - colour changing as each column becomes operative. The 'carry forward' is inserted in normal height but coloured 'CYAN' so, the next operation becomes Red, X Green + Cyan. Good use is made of the 'space bar' to insert the zeroes in the 'units' column before multiplying by the tens and, then by the 100s column. There is the usual choice of easy or hard questions - to do 2 or 5 sums and, the final objective for correct learning, a reward of six games of noughts and crosses for those who can achieve 5 out of 5 hard multiplications correct. These two programs cannot fail to encourage and improve learning.

Dave Reeder

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