How to subtract fractions from integers, how to calculate fractions from integers

Generally, it is used to form algebraic fractions first, and then to false fractions, such as such multi-digit decimal places can be converted to 3 and 625 1000 first, and then simplified. Then use 3 * 1000 + 625 = 3625 1000In fact, you can go straight to it.

Directly to 3625 1000

For 3 minus eight-fifteenths, you can turn 3 into a false fraction with a denominator of 8 and calculate it.

To decompose prime factors, you can use short division to find the common factor of multiple numbers, divide by this common factor, get a few new numbers, and so on until the resulting number is a prime number.

First turn 3 into a fraction, the denominator should be the same as the subtraction (8 15), so it is 45 15, so 3-8 15 is equal to 45 15-8 15, and the denominator is invariant and the numerator is subtracted, which is equal to 37 15, which is equal to 2 and 7 15

Just convert the whole number into a fraction and subtract it.

One decimal place is a tenth, and two decimal places are hundredths.

-8 15 = 2 and 15 15-8 18 = 2 and 7 15, the integer subtracts the fraction, just like the integer decreases, because the subtracted number has no fractional part, so when it is reduced, it needs to abdicate and subtract again. In fraction subtraction, take 1 from the subtracted number of integers and rewrite it as the fraction of the denominator of the denominator, such as 3 is rewritten as 2 and 15 15, 15 15 is rewritten from 1, and then subtracted, arithmearially the same as decimal subtraction. Because decimal is actually another way to write decimal fractions.

Many of the arithmetic theories in mathematics are actually the same.

2. To fractionate fractions, you only need to multiply the integer part with fractions by the denominator, and the resulting product is added to the numerator, which is the numerator of the result (is a false fraction), and the denominator remains unchanged.

625 is a decimal fraction, first rewrite it as 3 and 625 1000, and then reduce the fraction part to get 3 and 5 8.

4. It is difficult to explain the decomposition of prime factors. Short division can generally be used. Each time the prime number is removed, and the final quotient is also a prime number, so it is enough to write all the divisors and quotients in the form of multiplication.

For example: 36 decomposes prime factors, short division is a simple way to write vertically, it is not convenient to express here, so use horizontal expression to express the process of division, 36 2 = 18, then 2 to get 9, and then 3 to get 3, so 36 = 2 * 2 * 3 * 3

2=62 10, and then reduce the score to get 31 5, decimal fraction, first see how many digits it is, then rewrite the component parent to 1000 ......The numerator is the number composed of the numbers on each digit of the original decimal place, and then it can be reduced to the simplest fraction.

The whole number can be reduced to a false fraction (i.e., the numerator is large, the denominator is small, and = the denominator of the fraction to be subtracted), and then the numerator of the same denominator is subtracted, the difference is the numerator of the number, and the same denominator is the denominator of the number.

Replace the whole number into the form of a fraction first, and then subtract the numerators. (e.g., 5-3 4=xx, which becomes 20 4-3 4=17 4).

Numerator of integer = denominator of integer * fraction.

Divisibility features. 1. If the last digit of a number is a single or even number, the number is divisible by 2.

2. If the sum of all digits of a number is divisible by 3, then the integer is divisible by 3.

3. If the last two digits of a number are divisible by 4, then the number is divisible by 4.

4. If the last digit of a number is 0 or 5, the number is divisible by 5.

5. If a number is divisible by 2 and 3, then the number is divisible by 6.

Replace the whole number into the form of a fraction first, and then subtract the numerators. (e.g. 5-3 4=?.)

It becomes 20 4-3 4 = 17 4).

Numerator of integer = denominator of integer * fraction.

Integer subtraction fractions can be used to turn integers into false fractions, and then use the same denominatorThe difference between the subtractions is the numerator of the number obtained, and the same denominator is the denominator of the number.

A denominator will do.

Such as:1Integer trume fraction: 1 - 1 2 = 2 2 - 1 2 = 1 2

2.Integer minus false fractions: 4 - 5 3 = 12 3 - 5 3 = 7 3

3.Integer minus fraction: 7 - 5 2 3 (five and two-thirds) = 7 - 5 + 2 3) = 2 - 2 3 = 6 3 - 2 3 = 4 3

Think of it this way: 7 - 5 2 3 = 21 3 - 17 3 = 4 3

For example: 8 3 5

1. Treat integers as fractions with the same base as fractions (eight as forty fifths);

2. Subtraction (40/5 minus 3/5) The denominator remains unchanged, and the numerator is subtracted (37/5);

3. Draw the answer to a false score and replace it with a score (in the end, you get seven and two fifths).

The formula for subtracting integers is: integer minus algebraic fraction formula = integer - (algebra formula separated, divided into integer 4 numbers + true fraction) = integer - divided into integers - true fraction = new integer - true fraction = (new integer - 1 + 1) - true fraction = integer + new true fraction = integer (again) new true fraction = new algebra fraction.

Integer subtraction is to subtract the integer part of the fraction with the integer first, then take out a "1" from the integer and turn it into a false fraction with the same denominator as the fraction, subtract the numerator part of the fraction, and finally write the remaining number of the integer and the obtained fraction together.

For example: 10 - (2 and 3/5) = (9-2) + (1-3/5) = 7 + 2/5 = 7 and 2/5.

If the fractions can be reduced to decimals, they can be subtracted directly, e.g. 4-(3 4)=?3/4= ∴4-（3/4）=

If the fraction cannot be reduced to a decimal, an integer can be reduced to a fraction, e.g. 4-(4 7)=?4=28/7 ∴4-（4/7）=28/7-4/7=24/7

Hopefully, these two examples will make you understand