1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Liono4ka [1.6K]
3 years ago
13

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

Mathematics
1 answer:
IrinaVladis [17]3 years ago
5 0

<h2><u>PLEASE MARK BRAINLIEST!</u></h2>

<u></u>

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.

<em>Remember that you are doing all of this in your head!</em>

<em />

I hope this helps!

- sincerelynini

You might be interested in
In the Founder's Day Parade in Happy, USA, many organizations participate by building floats. The Float Committee has issued a d
kolezko [41]

Answer:

n = \frac{(427200 - 22250)}{178}

Step-by-step explanation:

The Float Committee has issued a decree that each float can only have 427,200 flowers on it this year.

Now, the Happy Campers have already attached 22,250 flowers to their float.

Hence, there can be more (427200 - 22250) flowers added to the float.

If the flowers come in containers which hold 178 flowers, then the number of such containers to be used more will be n = \frac{(427200 - 22250)}{178}  

So, this equation represents how many more containers they can use on their float. (Answer)

6 0
4 years ago
The table at the right shows how much Tony earns per hour for his summer jobs one day Tony spends 3 hours running errands he wan
Nadya [2.5K]

Answer:

Step-by-step explanation:

The table at the right shows how much tony earns per hour for his summer jobs one day tony spends 3 hours running errands he wants to use the money from his job to buy two banners.

im not getting it? what are the tools?

7 0
3 years ago
Read 2 more answers
Kat has 19 coins, all quarters and dimes, that are worth a total of $4. The system of equations that can be used to find the num
lorasvet [3.4K]
Since q+d=19, we can re-write this as d=19-q. Using the second equation 0.25q+0.1d=4 we can multiply both sides by 100. So we get 25q+10d=400. So now we can plug d=19-q into 25q+10d=400. So now we get, 25q+190-10q=400. Subtracting both sides by 190, we get 15q=210 and that q=14 plugging that in d=5
3 0
3 years ago
Three forces with magnitudes 300 Newtons, 180 Newtons, and 250 Newtons act on an object at angles −30◦ , 45◦ , and 135◦ with the
inn [45]

Answer:

  261∠36° Newtons

Step-by-step explanation:

A straightforward way to find the resultant is to add the x- and y-components of the forces:

  r = 300(cos(-30°), sin(-30°)) +180(cos(45°), sin(45°)) +250(cos(135°), sin(135°))

  = (300√3/2 +180√2/2 -250√2/2, -300/2 +180√2/2 +250√2/2)

  = (150√3 -35√2, -150 +215√2)

  ≈ (210.310, 154.056)

  ≈ 260.698∠36.22°

The resultant is approximately 261 Newtons at an angle of 36°.

_____

From components (x, y), the angle is found as arctan(y/x). The magnitude is found as √(x²+y²).

4 0
4 years ago
In January, Mr Tan's students read 20 books. In Febuary, they read 15 books. What is the percent increase or decrease in the num
vovikov84 [41]

Answer:

D. 25% decrease

Step-by-step explanation:

Since it's clear that they read less books to find how much it decreased we multiply 100 with 15 then divide it by 20

100 × 15 ÷ 20 = 75 this result shows a 25% decrease.

6 0
3 years ago
Other questions:
  • Chuck earned $72.50 mowing lawns. The gas for the mower cost $11.25 and he bought a new string for the trimmer for $7.75 Write a
    7·1 answer
  • Calculate 7/8 x c for c=8
    5·1 answer
  • Factor<br> 8a squared - A - 30
    15·1 answer
  • Find the square (5p-9)(5p-9)
    9·1 answer
  • George bought 3 peppers for a cost of $0.40 each. How much will he pay for the peppers?​
    7·1 answer
  • HELP PLEASE USE A GRAPH
    13·1 answer
  • Use a fives fact to help you solve 7x6.
    14·1 answer
  • Find the range of the function f(x)=-4x-8 for the domain {0,1,2}
    10·1 answer
  • The points A(–5, 5) and B(–5, –7) are plotted on the coordinate plane.
    5·1 answer
  • The solution shown for the equation is incorrect. What is the correct​ solution? What is the​ error?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!