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
Maksim231197 [3]
3 years ago
14

Its says use rounding or compatible numbers to estimate the sum and example 198 + 727 ans is 200+725=925 I still don't understan

d how to do it. Heres a problem 87+34 and here is one 222+203
Mathematics
2 answers:
Ede4ka [16]3 years ago
6 0
Okay, rounding is when you take a number such as 198 and imagine that it is something easier to do math with, like 200. 
200 is easier to add with because there are zeroes in the tens place and the ones place. 
725 is easier to add with than 727 because the ones place digit, (5), is an easier base to use, just like zero. 
Using the easier numbers, 200 + 725 = 925
Using the original numbers, 198 + 727 + 925
*Because you took two pieces from the 727 and added them to 198, the four numbers in this problem are compatible. 
Compatible numbers are when you use numbers that are close to the original ones and make it easier to do the problem in your head. 
____
In the case of 87+ 34, the simplest numbers to use would be 90 instead of 87 and 35 instead of 34. Not as easy as the first equation, but still doable. 
90+35+125
    or
87+34=121
____
In the case of 222+203, the simplest substitutions are 220 and 200. 
220+200=420
or
222+203=425
Hope this helps, 
Ahawk
DENIUS [597]3 years ago
3 0

Answer:

a) 121

b) 425  

Step-by-step explanation:

We are given the following information in the question:

198 + 727 + 200 + 725 = 925

This can be explained with the help of associative of addition and subtraction and commutative property of the addition.

Associative property:

a+(b+c) = (a +b )+c

Commutative property:

a+b = b+a

198 + 727 \\= 198 + ( 727 + 2)\\=198 + ( 2 + 727)\\=(198 + 2) + 725\\= 200+ 725 \\= 925

a)

87 + 34\\= 87 + ( 31 + 3)\\=87 + ( 3 + 31)\\=(87 + 3) + 31\\=90 + 31\\=121

b)

222 + 203\\=(220 + 2) + 203\\=220 + ( 2 + 203)\\=220 + 205\\=425

You might be interested in
PLEASE HELP
Leto [7]

Answer:

DA = 285.7 m

Step-by-step explanation:

First we need to find the side AB in the triangle ABC, and we can do this using Pythagoras' theorem:

AB^2 = BC^2 + AC^2

AB^2 = 300^2 + 400^2

AB^2 = 25000

AB = 500 m

We can find the angle ABC with the tangent relation:

tangent(ABC) = 400/300 = 4/3

ABC = 53.13°

From triangle ABC, we have:

ABC + BCA + CAB = 180°

53.13 + 90 + CAB = 180

CAB = 36.87°

From triangle DAC, we have:

DAC + ACD + CDA = 180

36.87 + 45 + CDA = 180

CDA = 98.13°

Now to find the side of DA, we can use law of sines in triangle DAC:

DA/sin(DCA) = AC/sin(CDA)

DA/sin(45) = 400/sin(98.13)

DA = 400 * 0.7071 / 0.9899 = 285.7258 m

Rounding to nearest tenth, we have DA = 285.7 m

3 0
3 years ago
Judith is planning a party for her younger brother. She has 36 prizes and 24 balloons. What is the greatest number of children w
jeka94
24 so each child can get at least one balloon
6 0
3 years ago
Read 2 more answers
Unit Test
wolverine [178]

Answer: c the third option

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
chelsea deposits $600 into a bank account and is earning simple interest.After 4 years her account has a balance of $621.60.If C
olga nikolaevna [1]
If she deposited $600 and had $621.60 after four years, then she earned: $621.60 - $600 = $21.60 in four years. It means in one year she earned $21.60 ÷ 4 = $5.40. Now we have to find out how many percent of $600 is $5.40:

$5.40 = x% from $600
5.4 = x/100 * 600
5.4 = 600x/100                 / * 100 (both sides)
540 = 600x                       / ÷ 600 (both sides)
x = 0.9

So the interest rate was 0.9% annually.

Now we have to find out how much is 0.9% from $1100:

$1100 * 0.9% =
= 1100 * 9/1009 =
= 9900/1000 =
= 9.9

It means in one year she would earn $9.90. After 7 years she would earn $9.90 * 7 = $69.30, so she would have in her account:

$1100 + $69.30 = <u>$1169.30</u>
8 0
4 years ago
The buying rate and selling rate of a Australian dollar in a bank are rs 80.20and rs 81.40respectively how much Australian dolla
olya-2409 [2.1K]

Answer:

5000 Australian Dollars

Step-by-step explanation:

To find out how many Australian dollars need to be sold, we first need to find the profit of a single dollar sold.

We will be using the formula for profit, which is:

Profit = Total Revenue - Total Cost

Now we define the available variables.

Total Revenue = 81.40

Total Cost = 80.20

Profit = 81.40 - 80.20

Profit = rs 1.20/dollar

Now we have to find how many dollars we have to sell to get a profit of rs 6000.

We simply divide the amount of profit that we want to the price per dollar.

Total Profit = 6000

Profit per dollar = 1.20

This give us:

6000 / 1.20 = 5000 Australian Dollars.

4 0
3 years ago
Other questions:
  • I need to know all of these
    11·2 answers
  • 98 POINTS AND I WILL GIVE BRAINLIES PLZZZ HELP
    8·2 answers
  • the floor of the commons room at king middle school is in the shape of a square with the side lengths of x^2 y^3. new tile is go
    6·2 answers
  • HELP ASAP PLEASE!!!
    8·1 answer
  • Help me with this - Label the origin, X-axis, and y-axis.
    7·2 answers
  • Identify all of the following that are prime numbers. A. 2 B. 11 C. 27 D. 31 E. 42 F. 59 G. 63 H. 72 I. 81 J. 97
    11·1 answer
  • A car salesperson earns a 18% commission on every car sold. The salesperson sells a car for $37,560. What is the commission?
    7·1 answer
  • Luigi uses 39 cups of flour for every 6 pizzas he makes. Complete the table using equivalent ratios.
    13·1 answer
  • Which shows the use of the commutative property?
    8·2 answers
  • An axiom in Euclidean geometry states that in space, there are at least
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!