Question about Casio fx-300ES Calculator

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EVERY TIME I TRY TO DO A PROBLEM WITH 10 TO THE NEGATIVE POWER MULTIPLIED BY ANOTHER NUMBER SAY 5, IT JUST GIVES ME FOR THE ANWER THE ACTUAL PROBLEM I KEYED IN AND NOT THE ANSWER

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Trying to enter Chemistry equations and it won't work...

the way i enter my equations is a bit different from what you're doing, i use the fraction button to do division problems, i just feel it makes it easier to read.
anyway, the fraction button is on the far left, 3rd button down (it looks like a white box on top of a line, and below the line is another empty box). press that, and you can type 1.0x10^-14 on the numerator.
it seems that you haven't discovered the EXPONENT button. that button is on the same row as the fraction button, it looks like an x with a white box next to it. press that once you've typed out "1.0x10", and then type -14. the negative button btw is below the fraction button, and looks like this: (-)
press the right arrow twice on the circle thingy at the top of all the keys, and that'll advance you to the denominator. type 2.0x10^-5, using that nifty exponent key. press the equal sign and it'll solve it for you, all in scientific notation (the answer is 5x10^-10). the problem with this calculator is, it won't expand that answer for you with all the decimals and everything, but if its chemistry that shouldn't be a problem.
also, you can certainly use the "x10^x" button on the very bottom of the keypad (its next to the decimal button). by using this key, you won't have to press the exponent button since you can just type in the exponent directly next to the 10.

as for that negative log of 5.6, just input the negative, the log button is right next to the exponent button, and your number and yeah....it's that easy :]

i hope you like this caculator, it has so many functions (have you seen the size of the manual??)
good luck on your chemistry test!

Posted on Jun 09, 2009

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SOURCE: eight multiplied by ten to the power of six

Press 8 [*10^x] 6 / 4 [*10^x] 3 =

[*10^x] is the key just below the 3 key.

Posted on Sep 08, 2011

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SOURCE: how do i change the mode on my Casio fx-82au plus calculator?

Press SHIFT [MODE] to bring up the mode screen. Press 8 for NORM, then 2.
Bear in mind that if the magnitude of the number is too large or too small the calculator will switch to scientific notation anyway. For example, if a number has twenty leading zeros then it won't fit on the display unless it displays it as a power of ten to the negative twenty.

Posted on Apr 02, 2012

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SOURCE: Hi there, i have the same problem with the Casio fx 83ES. Simple Sums difficult without Exp?

The Enter Exponent key may be marked as x10^x. It is in the last row of keys, near the =/EXE. To enter a negative exponent use the change sign key (-), not the minus key for subtractions.

Posted on May 02, 2012

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SOURCE: it still gives me an incorrect answer. In the

Apparently you're calculating 1x10^-14 / 3.3x10^12
Note the positive exponent on the denominator. Make sure you use the (-) key to enter a negative exponent.

Posted on Jun 07, 2012

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How do i do eqivalent ratios


Ratios are like fractions: to make an equivalent ratio you simply multiply both sides of the ratio by the same non-zero number. 1:2 is equivalent to 2:4 (both sides multiplied by 2). 10:12 is equivalent to 5:6 (both sides multiplied by 1/2).

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The initial population of a town is 2800, and it grows with a doubling time of 10 years. What will the population be in 12 years


The population doubles in ten years so the annual growth is the tenth root of two. The growth in twelve years is the annual growth rate raised to the twelfth power.

The tenth root of two is about 1.0718 . That value raised to the twelfth power is about 2.2974 . Multiplied by the initial population of 2800 gives 6433.

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(3/10)(-5)


-1.5 (negative 1 point 5 or negative three-halves).

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Just got a SHARP EL-531X, it won't do simple calculations with scientific notation, It keep saying


To enter the power of 10 with exponent use the Exp key followed by the exponent. If the exponent is negative, you must use the negation key (-) not the - key (for subtraction).
When you press the Exp key you do not type in the 10.

Mar 10, 2012 | Sharp Office Equipment & Supplies

1 Answer

I am trying to multiply in scientific notation but I don't how to do it when the power of 10 is a negative i.e 1.67 time 10 to the 21st power multiplied by 9.11 times 10 to the -31 power. thank you


Make sure you use the +/- key just to the right of the decimal point key when entering negative values, including exponents.

1 . 6 7 EE 2 1 * 9 . 1 1 EE +/- 3 1 =

Aug 30, 2011 | Texas Instruments TI-30XA Calculator

1 Answer

What is 9 to the 2nd power plus -7 to the 3rd power plus -6 to the 2nd power x 5


I never know if these questions are serious, but I'll play along.

Remember the definition of a power: it's a number multiplied by itself that many times. For example, 4 to the 3rd power (4^3) is 4 X 4 X 4, or 64. So the problem you list can be written

9^2 + (-7^3) + (-6^2) + 5, or

9 X 9 + (-7 X -7 X -7) + (-6 X -6) + 5

Don't forget that negative X negative = positive when multiplying.

81 + (-343) + 36 + 5 = -221

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In each example the number is x+y multiplied by x (2+3=5) then 5 * 2 = 10. Therfore your answer is 144 (9+7=16 then 16*9= 144.

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1 Answer

Maytag MDE5000AYW huge expense to heat it!


Typical Dryer Heater wattage is around 5,000 watts or 5KW multiplied by the amount of time you run it. For instance 5000 watts for one hour is 5 Kilowatt hours multiplied by your electric rate. This gives you a cost for running it for one hour.

However, your heater runs more when the clothes are wet but less and less as they dry. A thermostat turns the heaters off around 160 Deg and back on at about 135 deg for normal heat. As your clothes get closer to dry the heater reaches 160 faster and 135 slower so that the on time is continually decreasing.

All this cycling translates to a heater on time of about 70% total I'd guess. Even if your vent line was blocked your heater on time would decrease due to safety systems turning the heater off to prevent fires.

All that being said you can approximately calculate electricity use as 5 KW multiplied by the amount of time you ran it and that number multiplied by 70% to account for heater off time. For a 5000 watt heating element that would be 3.5 KW multiplied by your electricity rate per KW. Adding a 5 amp motor that runs all the time would make the figure about 4.1 KW.

If you're still following me you need to keep track how many hours you dry clothes for the month and multiply the final number from above by that.

Let me point out the things that use a lot of electricity and you can hopefully pin down one or two you can affect. The things that use the most power have heating elements in them:
  1. Stove
  2. Dryer
  3. Electric Heating
  4. Air Conditioner
  5. Electric Water Heater
  6. Dishwasher with heated water and heated dry
  7. Refrigerators and freezers with self-defrost feature
Keep in mind that having company for a week or lots of family members will affect all the numbers. Your utility company usually offers a free (part of the rate structure) service that will help you track down high usage if you have an unusually large bill. Consider asking their assistance.

Sep 24, 2009 | Dryers

1 Answer

Work out how long my battery will last using a


Your said your battery is rated for 85 amps / hour. This means 1 hour at 85 amps, 42 hours at 2 amps, 85 hours at 1 amp or any number of hours in between determined by 85 divided by the number of amps of the load connected. The microwave uses 600 watts. Since we can't reliably determine amps in an AC circuit - I can get close using the DC calculation. I'll assume 120 Volts at 600 watts for the microwave. Watts = Volts multiplied by Amps, so the microwave uses about 5 amps (120 x 5 = 600). HOWEVER, this is not an accurate way to determine AC amps when voltage and watts are known. I'll bet the microwave has the actual amount of amps (along with the model, voltage, wattage etc.) on a label on the back, side or inside the door. This is the information that is accurate. Use the amp rating provided on the name plate to determine how long the batter will last. Assume 8.5 amps is the value provided on the name plate.. 85 amp hour (85 AH) battery would supply an 8.5 amp (8.5 A) load for 10 hours because: 85 AH divided by 8.5 A = 10 H. The quality of the battery, and the losses contributed by the inverter will reduce the actual amount of time that the battery could supply the microwave.

I hope this helps!

Sep 18, 2009 | Panasonic Microwave Ovens

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How do i use e key above in key


The number immediately following the e key is the power to which the value of e (2.718281828) is raised. Thus, e5 is equal to 148.4131591, the same as (2.718281828^5) If you press the e key without entering a number after it, an error results. Therefore, the only way to read your equation [500e^0.4] is to assume that e is first being raised to the power of 0.4, then multiplied by 500. To enter this on the Casio, press 5 0 0 [shift] [In] . 4
You will get 745.9123488
If the equation is intended to read (500 multiplied by e) then this value raised to the power of 0.4, that doesn't make sense, as e has no number following it.

Your second equation, 6.1e^0.014 would be entered 6 . 1 [shift] [In] . 0 1 4
This returns a value of 6.186006

You omit the 'power of' sign when you enter the equations.

Hope this helps.

Apr 06, 2009 | Casio FX-9750GPlus Calculator

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