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)?

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  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.

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  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)?

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  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

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  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

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  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

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