# algebra est prod quotien

i have to estimate each product or quotient are these right?
-72 x 57 i got:
-4104 est -4000

-92 x (-41) i got
3772 = est: 3800

-83 x 52 i got:
-4316 est: -4500

-803 x (-106) i got
85228 est: 85000

49 x 61
2989 est: 3000

-476 / 90
-5.288 est:
-500/ 90 ?

538 / (-63)
500 / 60 ?

479 / (-61)
500 / (-60)?

1. 👍 0
2. 👎 0
3. 👁 227
1. Estimate is not a rounding problem. We are not supposed to know the exact answer when we do the estimates.

What is important with estimates is HOW you estimate, not just the final number.

Anybody with a calculator can get the exact value. The exercise is to estimate when we do NOT have a calculator (or cell phone!).

I don't know how you got -4000 for -72 x 57. I would have done -70*60=-4200,

For -92 x (-41), I would have got
-90*-40=3600
If you want more accuracy, I could have done
-90*-40+2*40+1*90=3770
...
and so on.

1. 👍 0
2. 👎 0
2. i understand what you said and agree i just was not sure if i was doing rignt or not? i have to estimate each product or quotient are these right? i got stuck on division ones:

-72 x 57 i got:
-70 x 60 - -4200

-92 x (-41) i got
3600

-83 x 52 i got:
-80 x 50 = -40000

-803 x (-106) i got
-800 x (-100) = 80000

49 x 61 i got 50 x 60 = 3000

i don't know about these division ones
-476 / 90
-500/ 90 ?

538 / (-63)
500 / 60 ?

479 / (-61)
500 / (-60)?

1. 👍 0
2. 👎 0
3. -476 / 90
-5.288 est:
-500/ 90
I would divide 476/100=4.76 and add 10%=5.24

538 / (-63)
500 / 60 ? Good

479 / (-61)
500 / (-60)? or try 480/60=8

1. 👍 0
2. 👎 0
4. so how about
-476 divide by 90
est:
-450 divide by 0 = -5

538 divide by (-63)
est: 540 divide by (-60) = -9

479 divide by (-61)
est: 480 divide (-60)
= -8

1. 👍 0
2. 👎 0
5. so how about
-476 divide by 90
est:
-450 divide by 90 = -5 [an acceptable estimate]
If you want to be fancy, try
-476/90 ~ 480/90 ~ 48/9 ~ 16/3 ~ 5.3

538 divide by (-63)
est: 540 divide by (-60) = -9 [OK]

479 divide by (-61)
est: 480 divide (-60) [OK]
= -8

1. 👍 0
2. 👎 0

## Similar Questions

1. ### math

Write the number that makes the statement true. 1. 205.5 m = _____ mm (1 point) 205,500 0.2055 20.55 20,550 2. 199.2 km = _____ m (1 point) 199,200 19.92 19,920 0.1992 Use benchmarks to estimate the sum. 3. + (1 point) 2 1 0

2. ### Halp me or i fall

Write the number that makes the statement true. 1. 205.5 m = _____ mm (1 point) 205,500 0.2055 20.55 20,550 2. 199.2 km = _____ m (1 point) 199,200 19.92 19,920 0.1992 Use benchmarks to estimate the sum. 3. + (1 point) 2 1 0

3. ### Math

1. What is the product of (5.1 x 10^3) x (3.2 x 10^3)? a. 16.32 x 10^6 b. 1.632 x 10^7 c. 16.32 x 10^9 d. 1.632 x 101^0 2. What is the product of (7.28 x 10^-2) x (9.1 x 10^-2)? a. 6.6248 x 10^-3 b. 66.248 x 10^-4 c. 6.6248 x 10^4

4. ### math

Determine whether the sign of the product or quotient is positive or negative. Part A the quotient of two negative integers A. positive B. negative Part B the product of an integer and its opposite A. positive B. negative

1. ### algebra

In the expression 2x + 3, the 2 is called the __________. A) coefficient B) power C) product D) quotient

2. ### Math

Find two numbers the quotient is in between then estimate the quote 90÷7

3. ### Algebra

Is 40 a reasonable estimate of a quotient for78,114 divided by 192? Explain your reasoning

4. ### math

estimate each quotient 461 divided by 9

1. ### math

find two numbers the quotient is between. Then estimate the quotient. 2. 41 divided by 3 3. 192 divided by 5.

2. ### Math - PreCalc (12th Grade)

Which combination of limit properties is required to evaluate this limit? lim x->((24/x)-2x+2)^3 A) sum, difference, product, root B) sum, difference, product, power C) sum, difference, quotient, power D) sum, difference,

3. ### Mathematics

I need help writing algebraic expressions into equations 1) the product of a number and 7 is 63 2) 10 subtracted from a number is 15 3) two-fifths of a number is -12 4) 8% of a number is 20 5) the sum of twice a number and 17 is

4. ### Math

Estimate each quotient 766÷8 \$31.75÷8