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Four basic operations on Rational numbers [DRAFT]

1.	Addition of various digits
2.	Division of rational numbers
3.	Multiplication of digits
4.	Subtraction of rational numbers

1.	Addition with same denominator Difficulty: easy	2
2.	The sum of the negative fraction if the denominators are the same Difficulty: easy	3
3.	Divide a fraction by integer Difficulty: easy	2
4.	Multiplication of a rational number Difficulty: medium	4
5.	The sum of negative mixed numbers Difficulty: medium	4
6.	Multiplication of a mixed number Difficulty: medium	4
7.	Divide and multiply Difficulty: medium	4
8.	Multiplication of two fractions Difficulty: medium	4
9.	Negative value added to real rational number Difficulty: medium	4
10.	Multiplication of three rational numbers Difficulty: medium	4
11.	Divide a mixed number by a positive or negative integer Difficulty: medium	4
12.	Subtract the negative part from the fraction Difficulty: medium	2
13.	Divide the mixed number Difficulty: medium	3
14.	Divide an integer by a real fraction Difficulty: medium	2
15.	Mixed number and integer (negative numbers) Difficulty: medium	4
16.	Division and multiplication of rational numbers(text format) Difficulty: hard	5
17.	Road, speed, time (rational numbers) Difficulty: hard	5
18.	Calculation of the unknown additive from the sum Difficulty: hard	5
19.	Rational expression (difference) Difficulty: hard	6
20.	Rational expression substitution Difficulty: hard	7

Training

Difficulty: easy

Methodical recommendation

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