Signed Numbers (Positive and Negative) - Examples, Exercises and Solutions

When there is no minus or plus sign before the numbers, we usually assume that these are positive numbers,

meaning, the expression equals to

(+1/4)*(+1/2)=

The dot in the middle represents multiplication.

So the question in other words is - what happens when we multiply two positive numbers together?

We know that plus times plus equals plus,

therefore the answer is "positive".

To solve the exercise you need to remember an important rule: Multiplying a positive number by a negative number results in a negative number.

$(−)×(+)=(−)$
Therefore, if we multiply negative 2 by 2 the result will be negative 4.

That is, the result is negative.

$+2\times-2=-4$

It's important to remember: when we multiply a negative by a negative, the result is positive!

You can use this guide:

Let's recall the law:

$(-x)\times(-x)=+x$

Therefore, the sign of the exercise result will be positive:

$-2\times-\frac{1}{2}=+1$

Let's remember the rule:

$(-x)\times(-x)=+x$

Therefore, the sign of the exercise result will be positive:

$-3\times-4=+12$

Let's remember the rule:

$(+x)\times(-x)=-x$

Therefore, the sign of the exercise result will be negative:

$-4\times+12=-48$

Let's remember the rule:

$(+x)\times(+x)=+x$

Therefore, the sign of the exercise result will be positive:

$+6\times+3=+18$

Remember the law:

$(+x)\times(-x)=-x$

For the sum of the angles of a triangle is always:

$-6\times+5=-30$

Let's remember the rule:

$(+x)\times(-x)=-x$

Therefore, the sign of the exercise result will be negative:

$+5\times-\frac{1}{2}=-2\frac{1}{2}$

Let's remember the law:

$(-x)\times(+x)=-x$

Let's think about which number we need to multiply by 10 to get 100:

$10\times10=100$

Now let's put the numbers together with the appropriate sign as written in the law above, and we'll get:

$+10\times(-10)=-100$

Let's remember the law:

$(-x)\times(+x)=-x$

Let's think about which number we need to multiply by 2 to get 4:

$2\times2=4$

Now let's put the numbers together with the appropriate sign as written in the law above, and we'll get:

$-2\times(+2)=-4$

Let's remember the law:

$(-x)\times(+x)=-x$

Let's think about which number we need to multiply by 2 to get 8:

$2\times4=8$

Now let's put the numbers together with the appropriate sign as written in the law above, and we'll get:

$+2\times(-4)=-8$

Let's remember the law:

$(-x)\times(+x)=-x$

Let's think about which number we need to multiply by 3 to get 9:

$3\times3=9$

Now let's put the numbers together with the appropriate sign as written in the law above, and we'll get:

$-3\times(+3)=-9$

Let's remember the law:

$(-x)\times(+x)=-x$

Let's think about which number we need to multiply by 6 to get 12:

$6\times2=12$

Now let's put the numbers together with the appropriate sign as written in the law above, and we'll get:

$-6\times(+2)=-12$

We will only look at whether the number is negative or positive.

In other words, the division exercise looks like this:

$+:+=$

Since we are dividing a positive number by a positive number, our result will necessarily be positive.