4 years ago

Explain 81-16 in mental math

Mathematics

2 answers:

Tems11 [23]4 years ago

3 0

Answer:

we have

(81-16)

One way to use mental math is to add 4 to both 81 and 16

81+4=85\\ 16+4=20\\ 85-20=65

therefore

81-16=65

the answer is

Step-by-step explanation:

Dovator [93]4 years ago

3 0

Answer:

65 See below

Step-by-step explanation:

when doing mental math you need to break it apart to more manageable chunks.

I would think of this as 70 and 11 - 6 = 75 then subtract 10 = 65

You might be interested in

Choose the numbers that are irrational. 3.624 0.6 0.87 -5

Amiraneli [1.4K]

Answer:

-5 because the number is before zero which irrational number

3 0

3 years ago

Write an expression so that the product of a whole number and a decimal is.0.28

Butoxors [25]

Let

x-------> the whole number

y------> the decimal number

we know that

$x*y=0.28$ ------> equation 1

assume the value of x and then calculate the value of y

Let

x=280

solve for y in the equation 1

$y= \frac{0.28}{x}$

substitute the value of x

$y= \frac{0.28}{280}$

$y=0.001$

therefore

the expression is equal to

280*0.001=0.28

5 0

4 years ago

Which conversion requires multiplication?A.B.C.D.

Lostsunrise [7]

Answer:

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

Evaluate the function with the given the given value of x. f(x)=x-7 when x= -2

aivan3 [116]

I hope this helps you

x= -2

f (-2)= -2-7

f (-2)= -9

8 0

3 years ago

a patient in a local hospital receives 300 ml of medication every 4 hours. how many liters of medication does the patient receiv

Arte-miy333 [17]

Answer:

1800

Step-by-step explanation:

24 divided by 4 equals 6. So 6 multiplied by 300 equals 1800.

6 0

3 years ago

Read 2 more answers