How can you use mental math to multiply numbers by 10?

Answers

Answer 1

Answer:

add a zero at the end of the number. 5x10=50. 60x10=600. 700x10=7000 etc.

Step-by-step explanation:

Answer 2

Answer:

Move the decimal point one space to the right

Step-by-step explanation:

Ex:

12*10=120            12=12.0 move the decimal one space to the right=120

You can also just add 0 if there isn't a decimal point

13.5*10=135                        move the decimal one space to the right

hope this helps :)


Related Questions

How do you find percentages?​

Answers

For example if you have a decimal, let’s say 0.225, you multiply it by 100 and that would equal to 22.5. This means that your percent is 22.5%

Step-by-step explanation:

if you have 3/4 you divide the part, 3, by the whole, 4

3 ÷ 4 = 0.75

then multiply 0.75 by 100, 75, then add a percentage sign: 75%

What is the l25I

1. -25

2. 25

3. 52

4. -52

Answers

the answer is 25! option 2.
It’s B, 25, thanks! Have a good day!

I feel like everyone on this app has just given up, because no one has been helping me with any of my math stuff. And it's just like a ghost town here​

Answers

Answer:

i see how you feel but ._. i just aint good at math shawty

Step-by-step explanation:

find fgh this is geometry!

Answers

Answer:

        m∠FGH  = 79°

Step-by-step explanation:

m∠FGH = 360° - 101° - 2×90° = 79°

Please please I beg you help me.

Answers

Answer:

-224t

This is all you had to do and hear is the annswer

How to solve (p^2)^5

Answers

Explanation: The power rule tells us that when we have a power taken to another power, we keep the base the same and we multiply the exponents.

So we have p¹⁰ which is our final answer.

The school cafeteria sells apples for $0.25 and pears for $1.15. On Thursday
they sold 9 pieces of fruit earning a total of $4.95. How many of each item did
they sell?
A. 5 apples and 4 pears
B. 5 apples and 3 pears
C. 7 apples and 2 pears
D. 6 apples and 3 pears

Answers

D because they sold $1.50 for apples and 3.45 for pears add that up and it’ll be 4.95

Answer:

D

Step-by-step explanation:

I looked first at what added together equals 9. then I did the equation 0.25x+1.15y=4.95. I put the numbers into the equation and got my answer

What is the value of m?

Answers

Answer and Step-by-step explanation:

We need to solve for m, and we do that by adding together the measure of angles SWT and TWV, and then equal them to 90.

36 + 6m + 6 = 90

Add 36 to 6.

42 + 6m = 90

Now, subtract 42 from both sides.

6m = 48

Now, divide each side by 6 to get m.

m = 8

So, we get the value of m to be 8.

#teamtrees #PAW (Plant And Water)

201 A quadrilateral with vertices at A(4,-4), B(4, -16), C(12, -16), and D(12, -4) has been dilated with a center at the origin. The image of D, point d', has coordinates (36,-12). What is the scale factor of the dilation?​

Answers

Answer:

D Is the answer

what is the value of A = sin10.sin50.sin70 ?

Answers

Answer:

The Answer is gonna be 0.2

0.1504 =0.2

Which of the following expressions is equivalent to 4(m – 16)?

Answers

Answer:

4m - 64

Step-by-step explanation:

Solve 4(m - 16)

4(m - 16) = 4 x m - 16 x 4

= 4m - 64

10x + 7y = -3
5x - y = 3

Answers

If this is a system of equations then:
Multiply 5x-y=3 by -2
=> -10x+2y=-6
Now you sum the equations:
10x-10x+7y+2y=-3-6
=> 9y=-9
Then just divide by 9: y=-1
Now to get x, choose one of the equations and use the value we got from y:
5x-(-1)=3 => 5x+1=3 => 5x=3-1
=> 5x=2
=> x=2/5

(x,y)=(2/5, -1)

What is the mead absolute deviation of this data set?
A) 1.56
B) 143
C) 14.3
D) 15.6

Answers

I think c not for sure tho

i need help finding the height of a cone and i do not know where to start. any help will be greatly appreciated:))

Answers

Answer:

h=12

Step-by-step explanation:

First look at the formula for finding the volume of a cone- [tex]V=\pi r^{2} \frac{h}{3}[/tex]

Next substitute any variables for values you already know- [tex]144\pi =\pi (6)^{2} \frac{h}{3}[/tex]

Then solve the equation.

A bakery offers a sale price of $3.50 for 4 muffins. What is the price per dozen?

Answers

Answer:

$10.5 per dozen.

Step-by-step explanation:

$3.50 x 3 = $10.5

4 = 3.50 4 x 3 = 12 = $10.5

A bouquet had 10 flowers and sold for $70. which is a rate of $_per flower

Answers

ANSWER: $7 per flower

Answer:

$7 per flower

Step-by-step explanation:

So to find the unit rate we divide the money by how many flowers sold:

70 ÷ 10 = 7

hope this helps:)

Can somebody help with this problem?

Answers

Answer:

x=-5 or -5

Step-by-step explanation:

x - 4 = 2x + 1

Subtract x from both sides canceling out the x on the left, getting...

-4 = x + 1

Then subtract the 1 from both sides canceling out the 1 on the right, getting...

-5 = x

Subtracting x from 2x gets you 1x which you just write as x because there is only one x. Doing the equation from the other side will still get you the same answer and I will show you.

x - 4 = 2x + 1

-x - 4 = 1

-x = 5

x = -5

Hope this helps!

Which expression can be used to determine the total weight of c crabs that weigh 6.2 ounces each and s shrimp that weigh 0.85 ounces each?
A 7.05(c+s)

B 6.2c+0.85s

C 0.85c−6.2c

D 6.2c−0.85s

Answers

Answer: B

Explanation:

Use the variable c for crabs and therefore it should be 6.2c because it is 6.2oz for each crab. The variable for shrimp is s and since it is 0.85oz for each shrimp, use 0.85s.

Since it is asking for the total weight, add these together and you get 6.2c + 0.85s

Hope this helps;)

what is (3w-21) (w+8) 0

Answers

This answer is 4w(0)

What is the distance between the points (-3, 4) and (1, -2)? Round to the nearest tenth if necessary.

Answers

Answer: 7.2

Step-by-step explanation:

distance = sqrt (1−(−3))^2+(−2−4)^2

distance = sqrt 52

Hope this helps!

HELP ASAP PLEASE.



a) according to the map on the left, Central Park is about 50 blocks long by 9 blocks wide. what is the approximate area of the park? show your work.




b)lets say the area of the map is 21 square inches. you want to make q enlarged map of central park to take with you on your journey. describe how you can determine the area of the the enlarged map.




c)supposed the scale factor you will ise to enlarge the map is 5:1. what is the approximate area of the park of the park in your enlarged drawing.




d) how did you apply proportional reasoning as you worked through these problems?

Answers

it is either the second one or the last one

Answer:

For (a) the answer is 450, 50(9)=450 total blocks.

Step-by-step explanation:

For (c), you will have to use a scale of 1 to 5, so, 450(5)=2,250.

For (b), if the map is 21 square inches and you want to enlarge it to the size you want, you would have to take the total value of the original map and multiply it by whatever factor it has to be multiplied by.

Now finally for (d), I applied proportional reasoning by looking at the dimensions and adding them all together to get the area value, then comparing the area value to the enlarged figure or decreased figure.

(I did this quite a long while ago, I'm going based on my memory and math skills, sorry if I failed horrendously.)

7(m+-13)=-42
(Solve for m)
Please help

Answers

Answer:

m=7

Step-by-step explanation:

Replace all occurrences of  +  −  with a single -. A plus sign followed by a minus sign has the same mathematical meaning as a single minus sign because 1⋅ − 1 = − 1

7(m-13)=-42

Divide each term by  7  and simplify.

m-13=-6

Move all terms not containing  m  to the right side of the equation.

m=7

Hope this helps!

Plz mark brainiest! =D

7(m+-13)=-42
(m+-13)=-42-7
(m+-13)=-49
m=-49+13
m=-36


i don't know if this correct or not

Andrew bought a bottle of water for $1.75, two books for $10.50 each, and a slice of pizza for $3.75. At the end of the day, he had $51.50 left. How much did Andrew start the day with?

Answers

Answer:

He had 78$ at the end of the day

Step-by-step explanation:

Adding up all the expenses he made then adding them to 51.50,

51.50 + 10.50 + 10.50 + 1.75 + 3.75

What is the remainder of (x 3 + 5x 2 − 32x − 7) ÷ (x − 4)?

Answers

Answer:

x^2 + 9x + 4 + 9/x - 4

Step-by-step explanation:

Simplify

I need help please!!!!!

Answers

Answer:

55

Step-by-step explanation:

6m+90=96m

Just help me please solve the following

Answers

Answer:

mk lets dk this. also remember don't get stressed over stuff like this! you got it!

Step-by-step explanation:

1) 5

2) 3

3) 6

4) 5

5) 9

6) 8

7) 3

because there were so many I didn't include the work but if you need work for one of them I can give you!

1. x = 5

2. y = 3

3. x = 6

4. y = 5

5. y = 9

6. w = 8

7. x = 3

someone help please i honestly don’t understand

Answers

Answer:

196 m^2

Step-by-step explanation:

Length of the side of the square = 14 m

area= 14×14 = 196 m^2

hope it helps...

have a great day!!

Given the definitions of f (x) and g(2) below, find the value of g(f(5)).
f(x) = x² - 6x – 6
g(x) = -3x + 11

Answers

Answer:

[tex]g(f(5)) = 44[/tex]

Step-by-step explanation:

First, solve for [tex]f(5)[/tex]

[tex]f(5) = 5^2-6(5)-6 = -11\\[/tex]

Then, plug in what you got for [tex]f(5)[/tex] into [tex]g(x)[/tex].  Since [tex]f(5) = -11[/tex] you will be solving for [tex]g(-11)[/tex].

[tex]g(-11) = -3(-11) + 11 = 44[/tex]

the answer is 44.

Please be sure to mark this answer as brainliest if it satisfies you.

Step-by-step explanation:

your answer is in the photo attached

In ΔABC, a = 4 inches, b = 5.8 inches and ∠C=99°. Find ∠B, to the nearest 10th of an degree.

Answers

Answer:

m∠B = 49.4°

Step-by-step explanation:

Use the law of cosines to get side c, and then the law of sines to get angle B

[tex]c^{2} = a^{2} + b^{2} - 2ab cos C\\ = 4^{2} + 5.8^{2} - 2(4)(5.8) cos 99\\ = 16 + 33.64 + 7.25855\\ = 56.25855\\c = \sqrt{56.25855} = 7.543[/tex]

sin C/c = sin B/b

sin 99/7.543 = sin B/5.8

sin B = 5.8 sin 99/7.543

        =  .75945

m∠B = arcsin .75945 = 49.4°

help help help help help help help help help help

Answers

Answer:

5/15

Step-by-step explanation:

17/15-x/15=12/15

x=5

if my answer helps please mark as brainliest.

Answer:

5/15

Step-by-step explanation:

17/15-x/15=12/15

x=5

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