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
Verdich [7]
3 years ago
14

Explain how to find 40×50 using mental math

Mathematics
2 answers:
lara [203]3 years ago
5 0
Just do 4x5 then add the zeros
umka21 [38]3 years ago
3 0
Think about 40 over 50 and a line separating the answer from the problem like this:

                 40
              x 50
              ---------
                200         0*0=0 5*4= 20 so just put the zero back on the answer and you get 200.

the answer goes under the dotted line
You might be interested in
from the top of an 800 foot tall car talk tower, tom sees a plane; the angle of elevation is 67 degrees. at the same instant tay
AlekseyPX

Answer:

Height of plane = 25971.7 meters

Step-by-step explanation:

let H =height of plane

Let x = distance ray to the point under the plane

800 foot = 245meters

1 mile = 1609meters.

Tan 81 = \frac{H}{1609+x}    -----------------------(1)

Tan 67 = \frac{H-245}{x}    -----------------------(2)

6.3134  = \frac{H}{1609+x}   ------------------------(3)

2.3556 =  \frac{H-245}{x}    -----------------------(4)

from (3) and (4)

H = 10158.26 + 6.3134x  ---------------(a)

H = 245 + 2.2336x ---------------(b)

equating both (a) and (b) we have:

9913.26 = 3.9576x

x = 2504.74

Subst. x = 2504.74 into (a)

H = 25971.7meters

8 0
3 years ago
Follow the steps to finish solving the equation -3x +18 = 7x
antiseptic1488 [7]

Answer:

hgshajshvaviahavhwuwhvwhhwzhzhhzvhappy

5 0
2 years ago
Read 2 more answers
a tank is 1/6 full of gasoline. If 8 litres are added it would be 1/4 full. how many litres does the tank hold?
shtirl [24]
Find a common denominator between the two

1/6 - 2/12
1/4 - 3/12

3/12 - 2/12 because 2/12 is what you started with

= 1/12

If 1/12 is 8 litres, it’s 8 x 12 = 96

The tank can hold 96 litres.
4 0
3 years ago
Passing through 1,-4 and -2,5
Nataly_w [17]

Answer:

If you are looking for the slope-intercept equation, it's y=−3x−1. Hope you have a great rest of the day and stay safe, be kind, and go beyond Plus Ultra!

4 0
2 years ago
A student got 68% of the questions correct on the Social Studies test. If there were 50 questions, how many questions did they g
kaheart [24]

Answer:

The answer is 34.

8 0
3 years ago
Read 2 more answers
Other questions:
  • What set of reflections would carry trapezoid ABCD onto itself?
    8·2 answers
  • A plane flies with an average velocity of -98.5 m/s for 45.0s. what was it's displacement?
    8·1 answer
  • Which equation is the inverse of y=9x^2-4
    10·2 answers
  • 6x - 1 = x + 19. What is x?
    6·2 answers
  • Round 9.511 to the nearest whole number.
    10·1 answer
  • Direction: Solve each of the following system of linear equations graphically then check, if the system of linear equations has
    15·1 answer
  • Molly has biweekly gross earnings of $839. 52. By claiming 1 more withholding allowance, Molly would have $16 more in her take h
    6·1 answer
  • On a piece of paper, use a protractor to construct a triangle with angle measures of 30° and 40°.
    15·2 answers
  • Have you ever seen a photo online that did not seem to have the colors right? Perhaps the colors looked unnatural or not appropr
    7·1 answer
  • Name_<br> Simplify. Your answer should contain only positive exponents.<br> 1) 4².4²
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!