Examples with solutions for Multiplication and Division of Signed Mumbers: Complete the following equation using the appropriate signs

Exercise #1

Fill in the missing sign (?):

412:(+13)?0 -412:(+\frac{1}{3})\text{?}0

Video Solution

Step-by-Step Solution

Note that we are dividing a negative number by a positive number:

:+= -:+=-

Therefore, the exercise is:

?0 -?0

Since we have a negative number, it is necessarily less than zero.

Therefore, the answer is:

- < 0

Answer

>

Exercise #2

Insert the missing sign:

95:7?0 -95:-7\text{?}0

Video Solution

Step-by-Step Solution

Note that we are dividing a negative number by a negative number, therefore:

:=+ -:-=+

This means the final exercise looks like this:

+?0 +?0

Since we got a positive number, it must be greater than zero.

The answer is:

+ > 0

Answer

<

Exercise #3

Fill in the missing symbol (?):

0:412.5?0 0:-412.5\text{?}0

Video Solution

Step-by-Step Solution

First let's solve the exercise on the left-hand side:

0412.5= \frac{0}{-412.5}=

Here we must remember the formula:

0x=0 \frac{0}{x}=0

In other words, when we divide 0 by any number, the result will always be 0.

Now we have:

0?0 0\text{?}0

Therefore, the answer is:

0=0 0=0

Answer

=

Exercise #4

Fill in the missing symbol (?):

+314:209:513?0 +314:-209:-5\frac{1}{3}\text{?}0

Video Solution

Step-by-Step Solution

Note that in the first step we are dividing a positive number by a negative number:

+:= +:-=-

Therefore, we the exercise is:

:?0 -:-?0

Now we are dividing a negative number by a negative number, that is:

:=+ -:-=+

Therefore, the final exercise will look like this:

+?0 +?0

Since we have a positive number, it is greater than zero.

Therefore, the answer is:

+ > 0

Answer

<

Exercise #5

0:+15:16?0 0:+15:-16\text{?}0

Video Solution

Step-by-Step Solution

Let's solve the exercise from left to right:

015= \frac{0}{15}=

Let's remember the formula:

0x=0 \frac{0}{x}=0

In other words, if we divide zero by any number, the result will always be zero.

Now we have received the exercise:

0:16?0 0:-16?0

Let's solve the exercise:

016= \frac{0}{-16}=

We'll remember the formula we wrote earlier, and we can see that the result is zero.

So the final exercise will look like this:

0?0 0\text{?}0

Therefore, the appropriate sign is:

0=0 0=0

Answer

=

Exercise #6

1218:0?0 -12\frac{1}{8}:0\text{?}0

Video Solution

Step-by-Step Solution

Let's first turn our attention to the exercise on the left hand side :

12180= \frac{-12\frac{1}{8}}{0}=

Remembering the below formula:

x0 \frac{x}{0}

Since no number can be divided by 0 we are able to ascertain that the expression has no meaning.

Answer

There is no meaning to the expression

Exercise #7

Fill in the corresponding sign for the following question

(2)(?3)=12 (-2)\cdot(?3)=-12

Video Solution

Step-by-Step Solution

We must first consider which value when multiplied by a negative results in a negative number.

Let's remember the rule:

(x)×(+x)=x (-x)\times(+x)=-x

Therefore, the answer is as follows:

+3 +3

Answer

(+) (+)

Exercise #8

Fill in the corresponding sign for the following question

(4)(?3)=12 (4)\cdot(?3)=-12

Video Solution

Step-by-Step Solution

Let's consider what we would need to multiply by a positive in order to obtain a negative number.

Let's remember the rule:

(+x)×(x)=x (+x)\times(-x)=-x

Therefore, the answer will be:

3 -3

Answer

() (-)

Exercise #9

Fill in the corresponding sign for the following question

(5)(?3)=15 (-5)\cdot(?3)=15

Video Solution

Step-by-Step Solution

We must first consider what we need to multiply by a negative in order to obtain a positive number.

Let's remember the rule:

(x)×(x)=+x (-x)\times(-x)=+x

Therefore, the answer is as follows:

3 -3

Answer

() (-)

Exercise #10

Fill in the missing symbol (?):

0.9:9:4?0 -0.9:-9:-4\text{?}0

Video Solution

Step-by-Step Solution

Note that in the first step we are dividing a negative number by a negative number:

:=+ -:-=+

This means that the exercise can be written as follows:

+:?0 +:-?0

Now we are dividing a positive number by a negative number:

+:= +:-=-

Therefore, the final exercise will look like this:

?0 -?0

We are left with a negative number, meaning a number less than zero.

Therefore, the answer is:

- < 0

Answer

>

Exercise #11

+800:4:a?0 +800:-4:a\text{?}0

Video Solution

Step-by-Step Solution

Note that in the first stage we are dividing a positive number by a negative number:

+:= +:-=-

Now the exercise is:

:a?0 -:a?0

Since we don't know whether a is a positive or negative number, we cannot determine the sign.

Answer

It is not possible to calculate

Exercise #12

Fill in the corresponding sign for the following question

(5)(?4)=20 (-5)\cdot(?4)=20

Video Solution

Step-by-Step Solution

We must first consider what value we need to multiply by a negative number in order to obtain a positive number.

Let's remember the rule:

(x)×(x)=+x (-x)\times(-x)=+x

Therefore, the answer is:

4 -4

Answer

() (-)

Exercise #13

Fill in the corresponding sign for the following question

(6)(?5)=30 (-6)\cdot(?5)=30

Video Solution

Step-by-Step Solution

We should first consider which value we need to multiply a negative number by in order to get a positive number.

Let's remember the rule:

(x)×(x)=+x (-x)\times(-x)=+x

Therefore, the answer is:

5 -5

Answer

() (-)