Question about Texas Instruments TI-30X-IISTK Scientific Calculator

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My calculator is returning an answer with a 7 for division

My calculator is returning an answer with a 7 when doing a division problem such as 1 divided by 3 = 7.3333333

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You need to set the number of decimal places to 1 or more.

• Press [2nd] [MODE] and scroll to FLOAT.
• Press the right arrow key until the number of decimal places needed is highlighted.
• Press the [ENTER] key.

For 2 decimal places, 2 should be highlighted. All answers will then be rounded to 2 decimal places.

• Press [2nd] [QUIT] to return to the home screen.

Posted on May 03, 2010

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Search a string of at least five numbers (for example, 65403) Identify all of the substrings that form numbers that are divisible by 3.


I guess a hint is that to see if a number is divisible by 3, you can add up the digits of the number and if the sum is divisible by 3, the number is divisible by 3. Another way of seeing if a number is divisible by 3 is to do an integer divide and then multiply back to see if you get what you started with. For example, 7 / 3 = 2. 2 * 3 = 6, thus 7 is not divisible by 3.

As for all the substrings, start at the 5th number and do substrings of length 1 to 5, Move to the next digit, do substrings of length 1 to 4. Move to the next digit, do substrings of length 1 to 3. Repeat until only 1 digit is left.

Good luck,

Paul

Apr 12, 2016 | Office Equipment & Supplies

1 Answer

1.71 to 4.56 ratio simpify


1.71/4.56 ratio simplified.

First, let's clean it up by multiplying top (numerator) and bottom (denominated) by 100. Now we have 171/456.

Next, I use an old trick. If you add up the digits in a number and the answer is divisible by 3, the number is divisible by 3.

1+7+1 = 9 and 9 is evenly divisible by 3, so 171 is divisible by 3.

Similarly, with 456, 4+5+6 = 15 and 3 goes evenly into 15, so 3 goes in evenly to 15. Alternatively, we can take the answer 15, and go 1+5 = 6 and 3 goes evenly into 6 so 3 goes evenly into 456.

171 ÷ 3 = 57
----- ----
456 ÷ 3 = 152

Since is 57, 5+7 = 12 and 1+2 =3, 3 goes into 57 19 times.
Since 152 is even, factors are 2 and 76. Factoring 76, 2 and 38. Factoring 38, 2 and 19. So 152 is 2 x 2 x 2 x 19.

Since 19 is common, we can divide top (numerator) and bottom (denominated) by 19.

57 ÷ 19 = 3
--- ----
152 ÷ 19 = 8

Thus, the final answer is 3/8.

Alternatively, you can factor 171 and 456 and divide by the highest common factor, which are the factors that are common to both.

Feb 22, 2015 | Office Equipment & Supplies

1 Answer

How to calculate decimal to octal


step 1: divide decimal number by 8
step 2: write down the residual of division
step 3: if the result of division if 7 or less, write it to the left of residual you wrote in step 2, and there you go, you;ve got an octal represent. If the result is greater or equal to 8 then:
step 4: divide that result by 8
step 5: write the residual of that division to the left of the last one you wrote
step 6: from tis point everything is the same as from step 3.

Example: calculate octal represent of 123

123 / 8=15 , and residual is 3
15 >= 8, so the next thing you do is:
15 / 8 =1, and residual is 7
so far, we have 73
1<=7, so you write it to the left of 7, and there you go, 173 is octal represent of 123.

Hope this was helpful.
if you want to check your calculations, most calculator software has option to automatically calculate octal represents, i.e.
http://www.statman.info/conversions/octal.html

May 21, 2014 | Computers & Internet

1 Answer

How do i factor numbers on a ti-30xs calculator


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

Dec 18, 2013 | Texas Instruments TI-30XA Calculator

2 Answers

How do I find what the percentage is . . . the amount is 4,117,484 out of a total amount of 163,715,657. I usually divide the amount by the total but when I use a calculator to check (by multiplication)...


100*4117484/163715657 gives me about 2.5%. Since you didn't specify the calculator your're using, I can't give you the exact keystroke sequence, but on a typical algebraic calculator it would be something like 1 0 0 * 4 1 1 7 4 8 4 / 1 6 3 7 1 5 6 5 7 =

On an RPN or RPL calculator, it would be
1 0 0 ENTER 4 1 1 7 4 8 4 * 1 6 3 7 1 5 6 5 7 /

Mar 04, 2011 | Office Equipment & Supplies

1 Answer

How do a take a division problem and square root it on a TI-84 Plus Silver Edition for example 87.34/5 then square root the answer. I can do the math, but how do I take the dvision answer and square...


Two ways:

2ND [square-root] ( 8 7 . 3 4 / 5 ) ENTER

8 7 . 3 4 / 5 ENTER then 2ND [square-root] 2ND ANS ENTER

The first sequence takes the square root of 87.34/5, the second sequence calculates 87.34/5 then takes the square root of the result.

Dec 15, 2010 | Texas Instruments TI-84 Plus Calculator

1 Answer

How to calculate 24124 mod 19937 in casio fx-991Ms calculator


The MOD function simply returns the remainder that is left over after dividing the two numbers.

In this case, its possible to see quite easily that only 1×19937 can be taken from 24124 before the remainder is less than 19937. The MOD function is therefore the same as 24124 - 19937 = 4187.

In cases that are less obvious, do the division, ie 24124 ÷ 19937 = 1.210011536[34]
[The last two digits are hidden on the display but still used in subsequent calculations].
Then obtain the fractional part by subtracting 1 to give 0.210011536[34]. Then multiply the answer by 19937 to give 4187. Assuming that you haven't cleared the screen between each section of the calculation, the screen will show "Ans×19937 [=] 4187".

May 10, 2010 | Casio FX-115MS Plus Calculator

1 Answer

I wana do tan-1(7 over 100).....how do i insert a fraction? in my old calculator there used to be a Ab/c button


2ND TAN ( 7 / 1 0 0 )

The bar in a fraction simply denotes division, so use the division key.

Jan 29, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

Multiplication error(?) with repeating decimal place fractions.


Hello,
You may have guessed right. The presence of the parentheses makes the content of the parentheses evaluated first. So there is a loss of precision.
On the Ti92 I do 7*(-1/7)+1 and find 0.
But with Floating mode set at 12 decimal digits I get
1/7.=.142857142857.
Then .142857142857.*(-7) + 1 gives 2E-14.
Try to calculate pi*(-1/pi) +1 or e*(1/e)+1.
Hope it answers your question.

Sep 29, 2008 | Texas Instruments TI-86 Calculator

2 Answers

Help me pls...


use your calculator and perform the division...that would give you the answer in decimal form.
1. 0.90....
2. 0.56
3. 0.60
4.0.033 and so on...you can do it....



Jul 06, 2008 | Audio Players & Recorders

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