Question

What's 3 3/4 x (-1 1/2)? I keep on getting the wrong answer

Answer 1

Please convert 3 3/4 into an improper fraction.

Then, separately, please convert (-1 1/2) into an improper fraction. Share your results here.

Answer 2

15/4

Answer 3

-3/2

Answer 4

mathmale?

Answer 5

@pooja195

Answer 6

@DanJS

Answer 7

@triciaal

Answer 8

@whpalmer4

Answer 9

@Yuna123

Answer 10

Nice work. Let's now multiply those improper fractions together:\[\frac{ 15 }{ 4 }*\frac{ -3 }{ 2 }\]

Answer 11

-12/8?

Answer 12

or 12/8

Answer 13

\[(\frac{ 15 }{ 4 })(\frac{ -3 }{ 2 })\]

Unfortunately, nothing here can be cancelled/ reduced.

Answer 14

Try multiplying these together. What's 15 times -3?

Answer 15

-12

Answer 16

15 times 2 is 30; 15 times 4 is 60. Try again. What's 15 times 3?

what's 15 times -3?

Answer 17

oh wait is the the rule for + and -? sub and add?

Answer 18

so -45?

Answer 19

You are multiplying here.

(-1)(-1)=1
(-1)(1)=-1

Yes, -45.

Now multiply the 2 denominators together.

4(2)=?

Answer 20

8

Answer 21

Now write your final result, remembering that you were dealing with fractions and multiplying two improper fractions together.

Answer 22

-6/1?

Answer 23

How did you obtain that? You had a numerator of -45 and a denominator of 8.

Answer 24

@loveIt this is just straightforward multiplication.

\[(\frac{15}4)(\frac{-3}2) = \frac{(15)(-3)}{(4)(2)} = \frac{-45}{8} = -\frac{45}8\]

Answer 25

if we factor the numerator and denominator, we can see there are no common factors, so this cannot be simplified further:
\[-\frac{45}8=-\frac{3*3*5}{2*2*2}\]

we can make this into an improper fraction, however.

\[45/8 = 5 \text{ with remainder of }5\]so \[-\frac{45}8=-5\,\frac{5}8\]