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
Zepler [3.9K]
1 year ago
12

Find the sum of each set of numbers, as well as the size n of each set of numbers (n = number of numbers in the set). Use these

exercises to practice techniques for adding numbers quickly. Try to do the problems without a calculator. Think about ways in which grouping the numbers might make them easier to add (1) (a) 25, 35, 19, 31 (i) Sum: (üi) n: (b) 101, 73, 49, 27, 24, 36 (i) Sum: (c) 25, 25, 25, 30, 30, 30, 32, 32, 32 i) Sum:

Mathematics
1 answer:
guapka [62]1 year ago
8 0

We have to add numbers without a calculator.

1) 25, 35, 19, 31

We can group them by the last digit, so they are easy to add:

25 + 35 = 20 + 30 + 5 +5 = 50 + 10 = 60

19 + 31 = 10 + 30 + 9 +1 = 40 + 10 = 50

Then, 60 + 50 = 110

numbers in the set n = 4

Sum = 110

2) 101, 73, 49, 27, 24, 36

We can group them again by the last digit (adding 10, like the previous example).

We can substract the last digit from one number and add it to the other one. The result will be the same, but they will become easier to add.

101 + 49 = 100+50 = 150

73 + 27 = 70 + 30 = 100

24 + 36 = 20 + 40 = 60

150 + 100 + 60 = 250 + 60 = 310

numbers in the set n = 6

Sum = 310

3) 25, 25, 25, 30, 30, 30, 32, 32, 32

In this case we have 3 times the same numbers, so we can add the three different numbers and then multiply the total by 3.

We can use the properties of the multiplication to simplify the product (we will use the distributive property)

25 + 30 + 32 = 27 + 30 + 30 = 87

87 * 3 = 80*3 + 7*3 = 240 + 21 = 261

numbers in the set n = 9

Sum = 261

You might be interested in
Daniel Potter bought a new car for $20,000.00. Two years later, he wanted to sell it. He was offered $14,650.00 for it. If he so
olga_2 [115]
Answer: 13.375% per year

Explanation:

1) Depreciation is the loss of value: $ 20,000.00 - $ 14,650.00 = $ 5,350

2) The percent of depreciation is amount of the depreciation divided by the value of the car when purchased, times 100.

That is (5,350 / $ 20,000) * 100 = 26.75 %

2) The rate is percent of depreciation per year:

depreciation rate = % of depreciation / number of years = 26.75%  / 2 = 13.375% per year.
5 0
2 years ago
Read 2 more answers
Miss Osborne is standing next to a tree at high noon the tree cast a 44 foot shadow and miss Osborne cast a 4 foot shadow how ta
Gwar [14]

Answer:ok soooo I did this last year but I don’t remember anymore

Step-by-step explanation:

3 0
3 years ago
What can you conclude about the tangent lines and the diameter of a circle?
svetlana [45]

Answer:

B. perpendicular Hope this helps!

6 0
2 years ago
1/3 of a number represented as n
slamgirl [31]
N/3 if thats what your looking for
3 0
3 years ago
I just need help set up
Vilka [71]

Answer:

Step-by-step explanation:

<em>Set up equations (L= Lisa; M = Maria; A = April; J = Jim)</em>

L = 12M

A = 2J

<em>Substitute x for Maria and 6x for Jim</em>

L = 12x

A = 2(6x) = 12x

<em>So, you get:</em>

Maria = x

Jim = 6x

Lisa = 12x

April = 12x

5 0
3 years ago
Other questions:
  • Need this done step by step asapp thank youuu
    10·1 answer
  • To convert 2.5 hours into minutes, which ratio could you multiply by? Remember that 1 hour = 60 minutes.
    8·1 answer
  • Can someone please help with this.
    8·2 answers
  • mollys jump rope is 6 1/3 feet long. Gals jump rope 4 2/3 feet lo g. How much longer is Molly's jump rope?
    14·2 answers
  • 3/4 −(x+ 1 /8 )= 5/16
    6·1 answer
  • Which is greater five ones and eight tenths or fifty eight tenths
    5·2 answers
  • A researcher is interested in estimating the mean weight of a semi trailer truck to determine the potential load capacity. She t
    5·1 answer
  • Por que razón los números fraccionarios y decimales no tienen un sucesor y un antecesor​
    9·1 answer
  • 5. Find the distance, d.
    15·2 answers
  • Write all proportions found on the figure. (Choose TWO answer choices)
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!