Any Easy way to Add/Subtract?

Question

Just any simple way will do.

Answer 1

Multiplying & Dividing negative numbers:

(negative) x (negative) = positive

(negative) x (positive) = negative

(positive) x (negative) = negative

(negative) / (negative) = positive

(negative) / (positive) = negative

(positive) / (negative) = negative

As for adding & subtracting, that's a little harder to explain quickly.

Addition:

-4 + -6 = -10

(since both are negative, you just add the two numbers)

-4 + 6 = 2

(since one is negative and one is positive, you subtract the numbers. Since 6 is larger than 4, the answer gets the same sign as the 6 - in this case, positive.)

4 + -6 = -2

(same as the last one, but this time the answer is negative because 6 is negative)

Subtraction:

-4 - (-6) = -4 + 6 = 2

(two negatives side-by-side is like multiplication - it turns them positive)

-4 - (6) = -4 + -6 = -10

(One negative minus one positive is the same as adding two negatives.)

4 - (-6) = 4 + 6 = 10

(same concept as first subtraction exampl

Answer 2

Addition     100+50=150

Subtraction    100-50=50

Answer 3

Say you want to add 100+100=1000. Now this a simpler way to add this drop all zeros add 10+10=100 just place the zero right of the last zero. The same will work with subtraction. Hope this helps.

Answer 4

I think its called the distributive property.

If u have to add 199=546,

then just add 540 + 200, which gives u 740 and then add 6 and subtract 1, so answer is 745.

It seems tricky, but u soon get the hang of it.  

Answer 5

If learning - Same as above, use a number line. Works best.

If Teaching - Only way i can describe is use an exampe:

Lets say problem is 4 - 3 = ?

Have 1 of something one color and 3 of something another color. Put them into a group and ask the question. If you take three away from four, how many do you have

Answer 6

use your fingers

Answer 7

use a number line

use a thermometer in degrees C  usign positive and negative temperature

an elevator up and down movement

think about money

beign in debt beign negative and positive = havign money in the bank