Question about Casio FX991ES Scientific Calculator

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- Make sure you're working with two fractions.
- Multiply numerator x numerator, then multiply denominator x denominator.

- Make sure you're working with two fractions
- Flip the second fraction upside down.
- Change the division sign into a multiplication sign.
- Multiply top x top and bottom x bottom.

- Convert mixed numbers into improper fractions.
- Take the whole (non-fraction) number and multiply it by the denominator.
- Add that answer to the numerator.
- Put that amount over the original denominator and you will have an improper fraction.

- Find the lowest common denominator (bottom number). For both adding and subtracting fractions, you'll start with the same process.
- Multiply fractions to match the lowest common denominator.
- Add or subtract the two numerators (top number) but NOT the denominators.

Mar 07, 2017 | Homework

It used to be. **The idea is that a prime decomposition must be unique.** If you write 13=1*13, you can also write 13=1*1*1*....*1*13. If you allow 1 to be a prime number, there is no unicity of any prime factor decomposition. Any prime number would have a infinity number of prime decompositions.

Sep 28, 2014 | Computers & Internet

I do not think that the FX115ES can give you the prime factor decomposition of a number. The FX115ES Plus may do it.

On the FX991 ES Plus there is key marked FACT.. It is the one between the Change sign key (-) and the HYPerbolic key.

I am afraid you will have to do the decomposition of the two numbers by hand. For example

1440=(2^5)(3^2)(5)

700=(2^2)(5^2)(7)

By multiplying the two number you can get a multiple of both but it won't be the smallest.

What you do is scan the two decompositions to identify the various prime factors, 2,3,5, 7

All those factors must be present in the LCM. For each prime factor, select the largest exponent . This is going to be 5 for factor 2, 2 for factor 3, 2 for factor 5, and 1 for factor 7

Hence**LCM(1440,700)= (2^5)(3^2)(5^2)(7^1)=50400**

Verify that 50400/1440=35 and 50400/700=72

On the FX991 ES Plus there is key marked FACT.. It is the one between the Change sign key (-) and the HYPerbolic key.

I am afraid you will have to do the decomposition of the two numbers by hand. For example

1440=(2^5)(3^2)(5)

700=(2^2)(5^2)(7)

By multiplying the two number you can get a multiple of both but it won't be the smallest.

What you do is scan the two decompositions to identify the various prime factors, 2,3,5, 7

All those factors must be present in the LCM. For each prime factor, select the largest exponent . This is going to be 5 for factor 2, 2 for factor 3, 2 for factor 5, and 1 for factor 7

Hence

Verify that 50400/1440=35 and 50400/700=72

Sep 22, 2014 | Casio FX-115ES Scientific Calculator

There is nothing you can do to make the calculator find the HCF for you. No point complaining about that. But if you are interested in doing it by hand (using the calculator to do the divisions for you) here how it is done.

**Example: **Here are the decompositions of two numbers

(2^5)*3***(5^4)**(7^3)***11** and **(2^3)***(5^6)*(11^2)***7**

The prime factors that are present in both decompositions are

2, 5, 7, and 11

From the two decompositions select the smallest power of each common prime factor. They are represented in** bold font**s.

2^3, 5^4, 7, 11

The highest common divisor/Highest common factor is

**(2^3)*(5^4)*7*11**

- Decompose the first number in prime factors. If a prime factor is repeated use the exponent notation:
**That helps.** **D**ecompose the second number in prime factors too, using the exponent notation.- Now look at the two decompositions. If a prime factor
**is present in both decompositions**it must be in the HCD /HCF, with the smallest of its two exponents. - Do that for all prime factors

(2^5)*3*

The prime factors that are present in both decompositions are

2, 5, 7, and 11

From the two decompositions select the smallest power of each common prime factor. They are represented in

2^3, 5^4, 7, 11

The highest common divisor/Highest common factor is

Mar 27, 2014 | Casio Office Equipment & Supplies

The calculator has no application that will find the highest common divisor (or HCF) but that should not be difficult to do by hand.

Decompose the first number in prime factors. If a prime factor is repeated use the exponent notation:**That helps**

Decompose the second number in prime factors too, using the exponent notation.

Now look at the two decompositions. If a prime factor is present in both decomposition it must be in the HCD /HCF, with the smallest of the two exponents. Do that for all prime factors

Example;

(2^5)*3***(5^4)**(7^3)***11**

**(2^3)***(5^6)*(11^2)***7**

The prime factors that are present in both decompositions are

2, 5, 7, and 11

From the two decompositions select the smallest power of each

2^3, 5^4, 7, 11

The highest common divisor/Highest common factor is

**(2^3)*(5^4)*7*11**

Decompose the first number in prime factors. If a prime factor is repeated use the exponent notation:

Decompose the second number in prime factors too, using the exponent notation.

Now look at the two decompositions. If a prime factor is present in both decomposition it must be in the HCD /HCF, with the smallest of the two exponents. Do that for all prime factors

Example;

(2^5)*3*

The prime factors that are present in both decompositions are

2, 5, 7, and 11

From the two decompositions select the smallest power of each

2^3, 5^4, 7, 11

The highest common divisor/Highest common factor is

Mar 27, 2014 | Casio Office Equipment & Supplies

Prime decomposition of 100

100=1*(

Mar 19, 2014 | Computers & Internet

Prime decomposition of 100

100=1*(

Mar 19, 2014 | Computers & Internet

No, 1 is not a prime number. The decomposition of a number into prime factors must be unique so 2=1x2 is prime but since 1 can be written as 1=1x1x1x1....x1 with an arbitrary number of factors this opens up a can of worms as far as unicity of the decomposition is concerned. Conclusion: 1 has been ruled out as a prime number.

I hope that this gives you an idea why 1 is no longer considered prime.

I hope that this gives you an idea why 1 is no longer considered prime.

Jul 10, 2012 | Mathsoft StudyWorks! Middle School Deluxe...

if you mean the Paleolithic (old stone age), you would be looking at relics of the Neandertals, the Lasceaux caves (sic), and *possibly* some of the megaliths- I forget if they were more a function of the Neolithic period. However if you are referring to the Archaen period of earth's history, you're looking at complex iron decomposition ores, and basalt.

Jun 22, 2011 | Computers & Internet

This is a partial solution for I do not have the TI89 titanium with me.

1. The easiest way is to insert the decimal mark (. dot or , comma) at the end of one of the elements of the fraction (numerator or denominator).

Ex: if you enter 1/2 the calculator displays the fraction 1/2, but if you enter 1./2 or 1/2. or 1./2. it displays 0.5

2. You can also configure the EXACT/APPROXIMATE mode option of the calculator ( Press Mode then scroll till you see exact/approximate) then choose AUTO, EXACT, or APPROXIMATE.

In the EXACT option the calculator will perform exact algebra ( Pi remains Pi not 3.14159... ).

In the APPROXIMATE option, calculations are performed numerically (everything is treated as a decimal number.)

In the AUTO option the calculator will try its best to keep the results as exact as possible :

x/6 + 1/2 yields x/6 + 1/2

x/6. + 1/2 becomes .166666..x +1/2

x/6. + 1./2 becomes .16666..x +0.5

My suggestion ( if you allow me) : Leave the calculator set on AUTO, and convert to decimals as needed by putting the decimal mark at the end of an integer.

I hope it helps.

1. The easiest way is to insert the decimal mark (. dot or , comma) at the end of one of the elements of the fraction (numerator or denominator).

Ex: if you enter 1/2 the calculator displays the fraction 1/2, but if you enter 1./2 or 1/2. or 1./2. it displays 0.5

2. You can also configure the EXACT/APPROXIMATE mode option of the calculator ( Press Mode then scroll till you see exact/approximate) then choose AUTO, EXACT, or APPROXIMATE.

In the EXACT option the calculator will perform exact algebra ( Pi remains Pi not 3.14159... ).

In the APPROXIMATE option, calculations are performed numerically (everything is treated as a decimal number.)

In the AUTO option the calculator will try its best to keep the results as exact as possible :

x/6 + 1/2 yields x/6 + 1/2

x/6. + 1/2 becomes .166666..x +1/2

x/6. + 1./2 becomes .16666..x +0.5

My suggestion ( if you allow me) : Leave the calculator set on AUTO, and convert to decimals as needed by putting the decimal mark at the end of an integer.

I hope it helps.

Jul 22, 2009 | Casio FX-115ES Scientific Calculator

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