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]]>Considering that a half can be written as 1/2 , I would say that this notation might have existed before the computing age.

David

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]]>Regarding your astonishment about general lack of math skills, et al, just remember that something around 20% of people are ‘functional illiterates’, according to stats from government. Add to that the ‘Peter Principal’ with another 50%, give or take > and so on; we should not be surprised > sadly.

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]]>The slash symbol / is the same as the division symbol ÷

It represents a numerator being over a denominator, such as 1/2 = 1÷2 = a half.

The / is used on computers for division in the same way * is used for multiplication.

Even though this is primary school level maths, the number of people who get it wing amazes me.

David

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]]>Multiplication & Division: 4 x 3 / 2 = 6 and 4 / 2 x 3 = 6 …. The order is irrelevant.

That’s what I wanted to know and didn’t get. The forward dash in the above equation, 4 x 3/2, stands for = 4 x 3 divided by 2. In Europe we would write it this way: 4 x 3 : (2). Sometimes the division sign is also written with a forward slash between the two dots. Matter of language, then, not loss of memory.

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]]>Adding the brackets changes the equation entirely. It now says 3 multiply the contents of the brackets rather than 3 subtract the rest of the equation.

3(-3×6)+2 = 3(-18)+2 = -54+2 = -52

David

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]]>You must keep the minus sign on the 18 when you add 2. You can change signs just because maths with negative numbers is a little harder.

Ask your favourite search engine for the answer and you will see it is -13.

David

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]]>3 – 18 + 2 = -13

Type it into Bing, Google or a calculator.

Subtraction is the same as adding a negative number. Try

3 + -18 + 2 = -13

-18 + 2 = -16 not -20

David

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