Even in elementary school are taught how to add and subtract numbers. To learn how to do this, you need to learn table addition and subtraction based on her table.

So, first-grader will be able to deduct nine of the seventeen or resolve any such example. However, to have a dead end it will reverse example of nature: how to subtract nine and seventeen.

Examples of negative numbers are on the school curriculum much later, when the person matures to abstract thinking.

instructions

1

Math, there are four types: addition, subtraction, multiplication and division. Therefore Examples outs will be four types. Negative numbers in brackets stand out example in order not to confuse the mathematical operation. For example, 6 - (- 7) + 5 (- 9) -4 * (- 3) or 34 (- 17).

2

Addition. This action may take the form of: 1) 3 + (- 6) = 3-6 = -3. Replacement steps: first the brackets are removed, "+" sign is reversed, then from the larger (in absolute value) of the number "6" takes less - "3", then the answer is assigned a sign of a larger, that is "-".

2) 3 + 3 = 6. This example can be written in a different way ( "6-3") or to decide on the principle of "take more out of a smaller sign and assign the response more."

3) -3 + (- 6) = - 3.6 = -9. In disclosing the brackets are replaced operations of addition to subtraction, and then summed up the modules of numbers and the result put the sign "minus".

3

Vychitanie.1) 8 - (- 5) = 8 + 5 = 13. Disclosed brackets action sign is reversed, it turns example in addition.

2) -9-3 = -12. Example elements are added and the answer gets a common sign "-".

3) -10 - (- 5) = - 10 + 5 = -5. In disclosing the brackets again changed the sign to "+", then the number is subtracted from the larger and smaller response - a sign of a larger number.

4

Multiplication and division.When performing multiplication or division sign has no effect on the action itself. If the product or division of numbers with various characters assigned to answer "minus" sign if the number of the same characters - always result in the sign "plus" 1) 4 * 9 = -36- -6: 2 = 3.

2) 6 * (- 5) = - 30 45 (- 5) = - 9.

3) -7 * (- 8) = 56- -44: (- 11) = 4.