explain how to make these couculations mentaly a. 99+54 b.244-99

Answers

Answer 1

PLEASE MARK BRAINLIEST!

Answer:

Use estimation

Step-by-step explanation:

A) 99 + 54

estimate that 99 is 100

estimate that 54 is 55

Add 100 and 55 together

100 + 55 = 155

Remember that you added 1 to 99 and 1 to 55

So you must subtract 2 from 155

155 - 2 = 153

Your answer is 153.

B) 244 - 99

estimate that 244 is 245

estimate that 99 is 100

Add 245 and 100 together

245 + 100 = 345

Remember that you added 1 to 245 and 1 to 99

So you must subtract 2 from 345

345 - 2 = 343

Your answer is 343.

Remember that you are doing all of this in your head!

I hope this helps!

- sincerelynini


Related Questions

Eric has made great progress in rehabilitating his knee with his physical therapist. The therapist measures the angle of Eric's fully bent knee as 45o. This angle is represented by ∠BCD in the diagram. Eric then extends his leg until it is completely straight, 180°. What is the full range of motion of Eric's knee, m∠ACD?

Help? Please, i been stuck on this nonsense for 15 mins now. (;´д`)

Answers

Answer:

180 i think please tell me if im wroung

Answer:

it would just be 135?

Step-by-step explanation:

are these ratios proportional? prove it
5/9 = 25/18
the / are fractions

Answers

5/9 = 25/18

Cross multiply:

5 * 18 = 9 * 25

Simplifying

5 * 18 = 9 * 25

Multiply 5 * 18

90 = 9 * 25

Multiply 9 * 25

90 = 225

Solving

90 = 225

No they are not

No they are not proportional

Can someone please answer correctly plzzzz!!!!

Answers

Answer:

A negative number means cups are being used and a positive number means cups are being delivered to the shop.

2329 paper cups are left by the end of the week

On Thursday anywhere from 100-400 cups were used, I found this by looking at the number of cups used the day before and the day after.

Step-by-step explanation:

What is the percentage of discount if an item cost $20 originally but you paid $17?


Show your math in a proportion or show your equations. Make sure both answers have the % sign!

Answers

Answer:

15%

Step-by-step explanation:

17     =    x

20       100

17*100 = 20x

1700 = 20x

15 = x

Answer:

%15 discount

Step-by-step explanation:

i did a test on this

I am confused *-* Oh and have a great day!

Answers

Answer:

Amelia rented a DVD and it was due to be returned on 26 November. She actually returned it to the shop on 12 December. The rental shop applies a fine of 9p for every day the DVD is overdue.

Work out the total fine paid by Amelia. Give your answer in £

I think it’s D but I’m not sure I hope it’s right

Your answer must be simplified. Solve for x

Answers

Answer:

X can be any number but because there is a line under the greater than symbol x > -42

Step-by-step explanation:

-42/7=-6

Answer:

x>-42

Step-by-step explanation:

[tex] \frac{ x}{7} \geqslant - 6[/tex]

[tex]x \geqslant - 42[/tex]

Which one?? help please for a grade!! due today

Answers

Answer:

its 10

Step-by-step explanation:

because all you have to do is add a zero for each place you go

Answer:

First one 10

Step-by-step explanation:

Angela deposited 2,400 into her bank account each year that she keeps her money in the bank, she will earn 3%. At the end of three years, how much money will she have earned of interest?

Answers

The answer is 2622.524
The answer is 216 because 2400 x .03 is 72 and then multiply that by 3

Are they equivalent please hurry

Answers

Answer:

no there not

Step-by-step explanation:

Answer:

no

Step-by-step explanation:

if you add -7x and - 6x you get -13x then you have to add x so you get -12x obviously showing that they are not equivalent.

Complete the equation of the line through (3,-1) and (4,7)


PLZ I really need help
I´m at this type of things

Answers

Answer:

y = 8x – 25

Step-by-step explanation:

Answer:

8x-25=y

Step-by-step explanation:

All we need is slope. (y2-y1)/(x2-x1). Now we just substitute values--(7+1)/1=8

Now we can plug in the slope as m, so

8x+b=y

Now all we have to do is plug in a point value and find B.

24+b=-1

Subtract 24 from both sides

b=-25

CHECK

32-25=7

Correct

Find the area of the following figure if a line drawn from the side of length 8 to the side of length 2 is 8 units long.

Answers

Multiply the length and with 4 4 5&5 and add them all up to get the answer

50 POINTS ILL GIVE BRAINLIEST !! RANDOM ANSWERS WILL BE REPORTED!!
Show two ways to simplify each expression. 1-6.

Answers

Answer:

Hope this helps :)

Step-by-step explanation:

15

(3^5)÷(3^5)

Simplify 3^5

243÷243

1

(3^5)÷(3^5)

3^5/3^5=3^5-5

3^5-5

3^5-5= 1

1

Formula: x^a/x^b=x^a-b

16

2^10/2^10

Cancel out 2^10

1

2^10/2^10

2^10/2^10=2^10-10

2^10-10

2^10-10=1

1

Formula: x^a/x^b=x^a-b

17

x^7/x^7x≠0

x≠0

18

(4x+2y)5÷(4x+2y)^5(4x+2y) ≠ 0

5/(4x+2y)^3 ≠ 0

5 ≠ 0

≠ =-y/2

19

No solution

20

p^4/p^4p ≠ 0

p≠ 0

no solution

Answer:

4.0303838 2938.3939 xxx

Solve the inequality

2−5w≤−8

Answers

Answer:

The inequality for w is 2

URGENT!!!!!!!!!!!!!!!!!!!!!!!!!!!!
An artist was able to draw one-half of a picture every hour. If he needed to paint 7 pictures for an art show, how many hours would it take him

Answers

Answer:

14 hours

Step-by-step explanation:

So we know that it take him 1 hour to paint half of a painting and he has 7 to do all you have to do is multiply 7 times 2 because it takes 2 hours to do 1 painting.

Answer:

I believe it should take an artist 14 hours. It's 14

Step-by-step explanation:

I did the math and got 14. I hope you have a good day!

What is the value of 8.3 X 10 ? A. eight hundred thousand, thirty B. eighty-three thousand C. eight thousand, three hundred D. eight hundred thirty

Answers

Answer:

The value of this would be 83,000 because 10 multiply to eachother 4 times is 10,000 than 8.3 times that is 83000, sorry guys

Step-by-step explanation:

Angel checks out 12 library books and Andy checks out 1/3​ less than that. How many books does Andy check out?

Answers

Answer:

8 books

Step-by-step explanation:

12/3= 4

12-4 = 8

There are 8 books does Andy check out.

What is Division method?

Division method is used to distributing a group of things into equal parts. Division is just opposite of multiplications. For example, dividing 20 by 2 means splitting 20 into 2 equal groups of 10.

Given that;

Angel checks out 12 library books and Andy checks out 1/3​ less than that.

Now,

Since, Angel checks out 12 library books and Andy checks out 1/3​ less than that.

Hence, The number of books for Andy = 12 - 1/3 of 12

                                                            = 12 - 1/3 × 12

                                                            = 12 - 4

                                                            = 8

Thus, There are 8 books does Andy check out.

Learn more about the divide visit:

https://brainly.com/question/844312

#SPJ2

PLEASE HELP ASAP :( IENFIEN

Answers

Answer:

4. -9

Step-by-step explanation:

4. -9 i think i might be wrong

Help please (highest degree)

Answers

Answer:

1

Step-by-step explanation:

because power of x is 1. Hope you will understand if not then comment. I will explain

ANSWER: 1
POWER OF X= 1

HELP QUICK PLS FAST!!!!!!!!!

Answers

Answer:

it would be 90

Step-by-step explanation:

The scale is 1:6. that means that the object is 6 times larger then the scale drawing.

Answer: 90

Explanation: the scale factor is 1:6 meaning the small object is 1 and the larger object is 6 multiple the small(15) by 6(the scale factor) and get 90.

You’ve been asked to give a report about global warming at your next school meeting. As you prepare your report, be sure to mention what you think the town can do to reduce its carbon footprint.

Answers

It can use bikes more often or carpool rather then using cars all the time this will help reduce toxic chemicals in the air.

Answer: Many researchers, engineers and environmentalists are expressing deep concerns about changes in the overall climate of the planet. Fossil fuels are being continuously used to produce electricity. The burning of these fuels produces gases like carbon dioxide, methane and nitrous oxides which lead to global warming. Deforestation is also leading to warmer temperatures. The hazard of global warming is continuously causing major damage to the Earth's environment. Most people are still unaware of global warming and do not consider it to be a big problem in years to come. What most people do not understand is that global warming is currently happening, and we are already experiencing some of its withering effects. It is and will severely affect ecosystems and disturb ecological balance. Because of the treacherous effects of global warming, some solutions must be devised. The paper introduces global warming, elaborates its causes and hazards and presents some solutions to solve this hot issue. Above all, alternative energy sources (solar, wind, hydro, geothermal, bio mass) need to be seriously pursued. Finding and using renewable sources of energy is one of the methods to combat the ever increasing global warming effectively.

Step-by-step explanation:Optimize Buildings. One of the more popular ways for a city to reduce its carbon footprint is to make its buildings more energy efficient. There are a number of practical, cost-effective ways that building owners can lower their emissions.

THIS CAN BE DONE TO REDUCE CARBON FOOTPRINT

n+(-n)=3+15 solve for n

Answers

Answer:

No solution (this has been checked btw)

A groundskeeper needs grass seed to cover a circular field 380 feet in diameter A store sells 70 pound bags of grass seed. One pound of grass seed covers about 500 square feet of field. What is the smallest number of bags the groundskeeper must buy to cover the circular field

Answers

4 bags.........................

Answer:

4 bags

Step-by-step explanation:

the formula for area is A=3.14 x r^2, r is radius, found by 380 divided by 2, giving you A=3.14 x 190^2, giving you 113,000. divide by 500, giving you 226, then divide by 70, giving you 3 and a decimal, round up, and you get 4.

Help I need this quick and show work thank you

Answers

Answer:

D) 12.25x+3.99=77.49

Step-by-step explanation:

Each shirt costs $12.25, so that means 12.25 times x the amount of shirts. Then, you add the $3.99 shipping amount. All of this adds up to 77.49.

So the answer would be D.

Answer:

D. 12.25x +3.99 = 77.49

Step-by-step explanation:

We don't know the amount of shirts Mrs. Garfield order, so we can assume that the amount of shirts is x.

We know the amount per shirt, so we can assume the total cost for the shirts is  12.25x

The problem also explained that there was a 3.99 shipping cost, so our equation would look like this.

12.25x+3.99

Lastly, we are told the total cost of the shipment. The total cost is 77.49. Since, 12.25x+ 3.99 is supposed to be the same as 77.49, the equation should look like this.

12.25x +3.99 = 77.49

Final Equation:

12.25x +3.99 = 77.49

This is the same answer as D. on the worksheet.

please answer this question for me

Answers

Answer:

I think 6.25 but don't take my word for it

Hope this helps :)

5 feet

a square mirror has sides that are all equivalent
so 5x5=25

Evaluate 2n - 3 for n = 5.

Answers

Answer:

7

Step-by-step explanation:

2n - 3

n = 5

Substitute in the given value and solve

2(5) - 3

10 - 3

7

2 times 5 which equals 10. 10-3 = 7. 7 is the answer

Multiply plzzzzzz!!!!!!

Answers

Answer:

5. A

6. B

7. A

Step-by-step explanation:

help me with this thing, its for middle school math

Answers

Answer:

idek man

Step-by-step explanation:

The answer is A. You replace N with one of the numbers and square it. ex: if n = 1 then the answer/sum equals 1 because 1 squared is 1. If n = 2 then the answer/sum is 4 because 2 squared is 4, and so on.

A group of randomly selected members of The Foodies Food Club were asked to pick their favorite type of food. The bar graph below shows the results of the survey. There are 244 members in The Foodies.food. The bar graph below shows the results of the survey.

Based on the data, what is the most reasonable estimate for the number of The Foodies members whose favorite food type is Italian?

Choose 1 answer:
(Choice A)
A 62
(Choice B)
B 98
(Choice C)
C 112
(Choice D)
D 146

Answers

Answer:(choice b) b: 98

Step-by-step explanation:

Answer:

98

Step-by-step explanation:

Hope this helps!

Im not to sure how to do this :,D

Answers

it is the first one i juts fisnhed the test and that’s correct

Write an inequality that represents the graph below:

Answers

The red dot and arrow are the solutions. The solid dot means the number is included. So it is equal to -5, the arrow is going to the right, so it is also greater than -5

The inequality is:

X >= -5