Dividing numbers When I divide 7.7/2 it rounds the number up, how do I turn off the rounding function?

The fraction 711/22 is an improper fraction (the numerator is greater than the denominator).
While there is nothing incorrect about this, an improper fraction is typically simplified further into a mixed number.
The whole number part of the mixed number is found by dividing the 711 by the 22. In this case we get 32.

The fractional part of the mixed number is found by using the remainder of the division, which in this case is 7 (711 divided by 22 is 32 remainder 7).

The final answer is: 32 7/22

Hi Anonymous,
You can make equivalent fractions by multiplying or dividing both top and bottom by the same amount, but only multiply or divide, never add or subtract, to get an equivalent fraction.
I've only shown the fraction part of your question as 1 is a whole number.
1/2 = 2/4, or 4/8, or 8/16 or 16/32 or 32/64 & so on.
Going the other way, dividing 2/4 by 2 will give 1/2.
But, only divide when the top and bottom would still be whole numbers, for instance you wouldn't use divide for odd number fractions, for example 1/3 or 3/5 etc.
Trust this helps, best regards Alan

This calculator does not have a key that you can use to find the prime factor of an integer.
You can however use the calculator to find the factors
1. If number is even divide it by 2
Keep dividing by 2, while keeping track of how many times you divided by 2.
If you divided 5 times by 2 before getting an odd number, then your first factor is 2^5
2. Now try dividing by 3, keep track of the number of times you divided by 3 before you could not divide by 3 any more. If you divided 0 times by 3, your second factor is 3^0, or 1 and 3 is not a factor.
If you divided 4 times by 3, your second factor is 3^4
3. Divide by 5, until you can't any more. Keep track of the number of times you divided by 5.
4. Divide by all other prime numbers 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, etc. For each prime number, keep track of how many times you divided by it, until you could not any more.

Example: 23100
Division by 2
23100/2=11550 ---------> 1 division by 2
11550/2=5775 ----------> 2 divisions by 2
Note that 5775 is not divisible by 2. No more divisions by 2.
First factor is 2^2

Division by 3:
5775/3=1925 ----------> 1 division by 3
1925/3=641. 66667 Not an integer. No more divisions by 3.
2nd factor is 3^1

Division by 5 (number ends in 5)
1925/5 =385 -------> 1 division by 5
385/5=77 ----------> 2 divisions by 5 and no more (quotient does not end in 0 or 5)
3rd factor is 5^2

Division by 7
77/7=11 --------> 1 division by 7, and no more
4th factor is 7^1=7

Division by 11
11/11=1
5th factor is 11^1=11

Assembling the factors 2^2, 3^1, 5^2, 7, 11
Prime factorization of 23100 is
23100=(2^2)(3)(5^2)(7)11

Nothing of the sort. Just locate the EE key. You access it by pressing [2nd][x^-1]. It is the one below the [sin] function key.
To enter Avogadro's number
Key in
6.02 [2nd][x^-1] 23 [=/Enter]
If you divide by that number just enclose it between parentheses to ensure correct calculation.
You can also enter it as described 4 lines above, press the = key. The number will be displayed. To divide by it, press the [x^-1] key and its reciprocal will be displayed ready to be multiplied.

MOD simply calculates the remainder that is left over after dividing by the MOD parameter.
For example, 10MOD7 = 3 since you can only divide 7 into 10 once, leaving a remainder of 3.
For larger numbers, eg 389487MOD31 you start by dividing 389487 by 31, which gives 12564.09677 (on the display), however you only want the fractional part so subtract 12564 to give 0.0967741935 . This includes the lower value digits that were previously hidden. Then multiply this result by 31 which gives 2.999999999 on the display. Since the result of a MOD calculation has to be a whole number, the answer needs to be rounded to 3. If the answer doesn't easily round to a whole number, it is likely that you have gone beyond the calculators working capacity.
An alternative method is to take the integer part of the first result (12564) and multiply it by 31 to get 389484, then subtract this from 389487, giving the answer of 3.

Finding the remainder from a division calculation is often referred to as using the MOD function, though this isn't available directly on the fx-991ES.
To obtain the remainder, for example when dividing 10 by 7, you can only divide 7 into 10 once, leaving a remainder of 3.
For larger numbers, eg when dividing 389487 by 31 (equivalent to 389487MOD31) the division gives an answer of 12564.09677 (on the display), however you only want the fractional part so subtract 12564 to give 0.0967741935 . This includes the lower value digits that were previously hidden. Then multiply this result by 31 which gives 2.999999999 on the display. Since the result of a MOD or remainder calculation involving integers has to be a whole number, the answer needs to be rounded to 3. If the answer doesn't easily round to a whole number, it is likely that you have gone beyond the calculator's working capacity.
An alternative method which avoids the rounding of the fractional part is to take the integer part of the first result (12564) and multiply it by 31 to get 389484, then subtract this from 389487, giving the answer of 3.

You convert the fractions so they have the same denominator (bottom number) then subtract the numerators (top numbers). 7/2 is the same as 28/8 (8 divided by 2 = 4. 4 times 7 = 28, so the equivalent fraction is 28/8. You can check by dividing 8 into 28 = 3 1/2 = 7/2. So, 3/8 - 28/8 = negative 25/8 or 3 1/8.

The manual for the Canon P1-DHV is online at http://www.usa.canon.com/app/pdf/calculator/P1-DHV_G_USA_HWB.pdf>.
When the display shows "5/4", the calculator is doing 5/4 rounding which means: 5 or above round up, 4 or below round down. To control rounding press the "5/4" key.
When the display shows "E" the calculator could not complete a calculation. It can be because of dividing by 0, or because the total exceeded 1 trillion, or because the operator entered calculations faster than the calculator could complete them. Press the CI/C key to clear it.
I can't explain why you are not getting a total on the tape. Try the following example from the manual exactly as shown, and let me know if your tape shows the total.

1. Clear the calculator (press [CI/C])
2. Choose 5/4 rounding (press [5/4] until "5/4" displays)
3. Choose add mode (press [DEC] until "A" displays)
4. Choose cost-sell-margin mode (press [B-T] until "B" displays)
5. Turn printer on (press [PRINT] until "PRINT" displays)
6. To calculate: $12.55 + $15.75 - $5.30
7. Key in: 1255 [+] 1575 [-] 530 [=]
8. Tape shows: [0. C] ... [12.55 +] ... [15.75 -] ... [5.30 =] ... [23.00 *]

Transforming 0.175 to fraction:
= 175/1,000
Reduce to lowest term (divide by 5 both the numerator and the denominator):
= 35/200
Reduce further by dividing both by 5:
= 7/40
This is the lowest terms now that it can't be reduced further.
The "Other" way round, Bottom number into ONE and multiply it by the Top. EG: 3/4 == 1 divided by 4 = 0.25, now we multiply, .25 by the Top number or in this case 3, that equals 0.75. 1/4 =0.25 x 3 = .75. 3/4 is the same as 0.75.

Use the Math.Round() function. It takes two arguments, the first is your number or a variable holding your number and the second is the number of decimal places. This will only round to fractions of a whole number though and you need to round to the nearest 10. So divide your number by 10 before you round to shift the decimal place once to the left and multiply by 10 again afterwards to shift it back again.

answer = Math.Round(32.1 / 10, 0) * 10