Examples with solutions for Multiplication and Division of Signed Mumbers: Division between negative numbers

Exercise #1

5.4:0.9= -5.4:-0.9=

Video Solution

Step-by-Step Solution

Let's break down 5.4 into a subtraction exercise as follows:

5.4=50.4 -5.4=-5-0.4

Now let's convert the exercise into subtraction with fractions:

5410=5×1010410=5010410 -5-\frac{4}{10}=-5\times\frac{10}{10}-\frac{4}{10}=-\frac{50}{10}-\frac{4}{10}

Let's combine the subtraction exercise between the fractions into one fraction:

50410=5410 \frac{-50-4}{10}=-\frac{54}{10}

Let's write the second decimal fraction as a simple fraction:

0.9=910 -0.9=-\frac{9}{10}

Now the exercise we got is:

5410:910= -\frac{54}{10}:-\frac{9}{10}=

Let's convert the division exercise into multiplication, and don't forget to switch between the numerator and denominator in the second fraction:

5410×109= -\frac{54}{10}\times-\frac{10}{9}=

Let's reduce the 10 in both fractions and we get:

+549=6 +\frac{54}{9}=6

Answer

+6 +6

Exercise #2

66.6:0.6= -66.6:-0.6=

Video Solution

Step-by-Step Solution

Let's convert 66.6 to a simple fraction:

66.6×1010=66610 -66.6\times\frac{10}{10}=-\frac{666}{10}

Let's convert 0.6 to a simple fraction:

0.6=610 -0.6=-\frac{6}{10}

Now the exercise we received is:

66610:610= -\frac{666}{10}:-\frac{6}{10}=

Let's convert the division exercise to a multiplication exercise, and don't forget to switch the numerator and denominator in the second fraction:

66610×106= -\frac{666}{10}\times-\frac{10}{6}=

Let's reduce the 10 in both fractions and we get:

+6666= +\frac{666}{6}=

Let's factor 666 into a multiplication exercise:

6×1116= \frac{6\times111}{6}=

Let's reduce the 6 in the numerator and denominator of the fraction and we get:

+111 +111

Answer

+111 +111

Exercise #3

35:7= -35:-7=

Video Solution

Step-by-Step Solution

First, let's write the exercise in the form of a simple fraction:

357= \frac{-35}{-7}=

Now let's factor 35 in the numerator:

7×57= \frac{-7\times5}{-7}=

Since we have negative numbers in the numerator and denominator of the fraction, the result of the fraction will necessarily be positive.

Let's simplify between the 7 in the numerator and denominator of the fraction, and we get:

+5 +5

Answer

+5 +5

Exercise #4

1.8:0.09= -1.8:-0.09=

Video Solution

Step-by-Step Solution

Let's convert 1.8 to a simple fraction:

1.8=1810 -1.8=-\frac{18}{10}

Let's convert 0.09 to a simple fraction:

0.09=9100 -0.09=-\frac{9}{100}

Let's multiply the first fraction we got by 10 to get a common denominator of 100:

1810×1010=180100 -\frac{18}{10}\times\frac{10}{10}=-\frac{180}{100}

Now the exercise we got is:

180100:9100= -\frac{180}{100}:-\frac{9}{100}=

Let's convert the division exercise to a multiplication exercise, and don't forget to swap the numerator and denominator in the second fraction:

180100×1009= -\frac{180}{100}\times-\frac{100}{9}=

Let's reduce the 100 in both fractions and we get:

+1809= +\frac{180}{9}=

Let's break down 180 into a multiplication exercise:

9×209= \frac{9\times20}{9}=

Let's reduce the 9 in both the numerator and denominator of the fraction and we get:

+20 +20

Answer

+20 +20

Exercise #5

19:76= -19:-76=

Video Solution

Step-by-Step Solution

First, let's write the exercise in the form of a simple fraction:

1976= \frac{-19}{-76}=

Since we have negative numbers in both the numerator and denominator of the fraction, the result of the fraction will necessarily be positive.

Now let's break down the 76 into a multiplication exercise:

1919×4= \frac{19}{19\times4}=

We'll reduce between the 9 in the numerator and denominator of the fraction and get:

+4 +4

Answer

+14 +\frac{1}{4}

Exercise #6

5.8:3.4= -\text{5}.8:-3.4=

Video Solution

Step-by-Step Solution

Let's convert 5.8 to a simple fraction:

5.8=5810 -5.8=-\frac{58}{10}

Let's convert 3.4 to a simple fraction:

3.4=3410 -3.4=-\frac{34}{10}

Now the exercise we got is:

5810:3410= -\frac{58}{10}:-\frac{34}{10}=

Let's convert the division exercise to a multiplication exercise, and don't forget to swap the numerator and denominator in the second fraction:

5810×1034= -\frac{58}{10}\times-\frac{10}{34}=

Let's reduce the 10 in both fractions and we get:

+5834= +\frac{58}{34}=

Let's break down the numerator and denominator into multiplication exercises:

2×292×17= \frac{2\times29}{2\times17}=

Let's reduce the 2 in both the numerator and denominator of the fraction and we get:

2917 \frac{29}{17}

Answer

2917 \frac{29}{17}

Exercise #7

1.4:7= -1.4:-7=

Video Solution

Step-by-Step Solution

Let's convert 1.4 to a simple fraction:

1.4=1410 -1.4=-\frac{14}{10}

Let's convert 7 to a simple fraction:

7=71 -7=-\frac{7}{1}

Now the exercise we got is:

1410:71= -\frac{14}{10}:-\frac{7}{1}=

Let's convert the division exercise to a multiplication exercise, and don't forget to swap the numerator and denominator in the second fraction:

1410×17= -\frac{14}{10}\times-\frac{1}{7}=

Let's combine into one multiplication exercise:

+14×110×7=1410×7= +\frac{14\times1}{10\times7}=\frac{14}{10\times7}=

Let's break down 14 into a multiplication exercise:

2×710×7= \frac{2\times7}{10\times7}=

Let's reduce the 7 in both the numerator and denominator and get:

210= \frac{2}{10}=

Let's break down 10 into a multiplication exercise:

22×5= \frac{2}{2\times5}=

Let's reduce the 2 in both the numerator and denominator and get:

5 5

Answer

15 \frac{1}{5}

Exercise #8

8:12= -8:-12=

Video Solution

Step-by-Step Solution

Let's write the exercise as a fraction:

812= \frac{-8}{-12}=

We'll break down the numerator and denominator into multiplication exercises:

4×24×3= \frac{-4\times2}{-4\times3}=

We'll simplify the 4 in the numerator and denominator of the fraction and get:

23= \frac{-2}{-3}=

Let's remember that when we divide a negative number by a negative number, the result will always be positive.

Therefore, the answer is:

23 \frac{2}{3}

Answer

23 \frac{2}{3}

Exercise #9

9:3= -9:-3=

Video Solution

Step-by-Step Solution

Let's write the exercise in the form of a simple fraction:

93= \frac{-9}{-3}=

We'll factor the numerator of the fraction into a multiplication exercise:

3×33= \frac{-3\times3}{-3}=

We'll cancel out the 3 in the numerator and denominator of the fraction.

Let's remember that since we are dividing a negative number by a negative number, the result will necessarily be a positive number.

Therefore, the answer is:

3 3

Answer

3 3

Exercise #10

(0.3):(0.8)= (-0.3):(-0.8)=

Video Solution

Step-by-Step Solution

Let's convert 0.3 to a simple fraction:

0.3=310 -0.3=-\frac{3}{10}

Let's convert 0.8 to a simple fraction:

0.8=810 -0.8=-\frac{8}{10}

Now the problem we received is:

310:810= -\frac{3}{10}:-\frac{8}{10}=

Let's convert the division problem to a multiplication problem, and don't forget to switch the numerator and denominator in the second fraction:

310×108= -\frac{3}{10}\times-\frac{10}{8}=

Let's simplify the 10 and we get:

38 \frac{3}{8}

Answer

38 \frac{3}{8}