Give one example of when you would use the friendly numbers strategy to subtract.

Answers

Answer 1

Answer: I would say: when we want to substract numbers that are close to each other, but when the respective digits of the number from which the second number is subtracted are lower than in the other number.

For example, when we want to substract 18 from 21. Those two numbers are very close, but if you did it digit by digit, your would run into a problem.

So instead you can collect their differences to the friendly number 20: 21 is one number away from 20, and 18 two numbers, which makes a total of 3 numbers: and 3 is the solution!

Answer 2

Answer:

For this case, we use the strategy of friendly numbers when subtraction is something complex to do mentally.

Let's suppose that we have the following subtraction:

$117 - 83$

Using friendly numbers we have:

$(100 + 17) - (80 + 3)$

Then, applying the associative property we have:

$(100 - 80) + (17 - 3)$

Doing the calculations we have:

$20 + 14 = 34$

Finally we have:

$117 - 83 = 34$

Related Questions

Find the value of x.
What is the prime factorization of 44?4 x 11 2 x 22 2 x 2 x 11 2 x 2 x 2 x 5
Ms. Howard wrote a test. Part A had true/false questions, each worth points. Part B had multiple choice questions, each worth points. She made the number of points for Part A equal the number of points for Part B. It was the least number of points for which this was possible.
Solve for W.-4(w +1) = -24W=
Simply the following radical expressions completely. Use the radical symbol in the equation editor to enter your response. 2✔️48

14 ounces of olive oil for $3.59

Answers

25. 6 cents for each ounce

This dot plot shows the number of cakes sold each day in aunt alice's cake shop last month. what is the median number of cakes sold each day?

Answers

Answer:

The median is 2.

Step-by-step explanation:

I just did the test :)

Answer:

the answer should be 2

Step-by-step explanation:

-16t squared + 16t + 480 t=time after jumping in seconds h=height in feet How many seconds did did it take her to hit the water

Answers

that is height
h=16t^2+16t+480
when h=0 is when it hits the water

0=16t^2+16t+480
undistribbute 16 for ease
0=16(t^2+t+30)
16*0=0 so assume
t^2+t+30=0
factor
(t+6)(t-5)=0
set to zero

t+6=0
minus 6
t=-6
false, since you cannot have negative time

t-5=0
add 5
t=5

at t=5 she hits the water

5 seconds

What is the product? Express the answer in lowest terms.2Two and three-fourths times one-half

1.One and one-eighth
2.One and three-eighths
3.Two and one-eighth
4.Two and three-eighths