diff --git a/practica/math/README.md b/practica/math/README.md
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--- a/practica/math/README.md
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@@ -6,26 +6,26 @@ Here you can find useful programs, functions and ready-made solutions for variou
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 Here you can find math tasks, which i did for myself
 
-- [Overpayment](overpayment.py) - calculation of loan overpayment
+- [Overpayment](ord_tasks/overpayment.py) - calculation of loan overpayment
 
 ## Math|stat tasks
 
 Here you can find statistic tasks, which can be usefull in econometric calculations
 
 ### Variance
-- [ Rejection of the null hypothesis](Variance\Null_hypothesis_rejection.py) - calculate whether we reject the null hypothesis or not
-- [Population variance](Variance\Population_variance.py) - the variance of the larger population function
-- [Sample variance](Variance\sample_variance.py) - Sample variance function
-- [Variance](Variance\Variance.py) - ccalculate the variance of list form
+- [ Rejection of the null hypothesis](statistic/Variance\Null_hypothesis_rejection.py) - calculate whether we reject the null hypothesis or not
+- [Population variance](statistic/Variance\Population_variance.py) - the variance of the larger population function
+- [Sample variance](statistic/Variance\sample_variance.py) - Sample variance function
+- [Variance](statistic/Variance/Variance.py) - ccalculate the variance of list form
 
 ### Statistic tasks
-- [Arithmetic mean](Statistic_tasks\Arithmetic_mean.py) - the arithmetic mean of a given set of values function
-- [Greatest common divisor](Statistic_tasks\Greatest_common_divisor.py) - calculate the GSD
-- [Least common multiple](Statistic_tasks\Least_common_multiple.py) - calculate the LCM
-- [Median](Statistic_tasks/median.py) - the median function
-- [Multiplication tables](Statistic_tasks\multiplication_tables.py) - multiplication tables in the form of a table of 2 horizontal and 2 vertical values
-- [Number square root](Statistic_tasks\Number_square_root.py) -  the square root of the number function
-- [Range](Statistic_tasks\range.py) - the function of mathematical range
-- [Mean of numbers on a segment](Statistic_tasks\mean_of_nm_on_segment.py) - 
-- [Standard deviation](Statistic_tasks\Standard_deviation.py) - calculate the standard deviation of list
-- [Sum](Statistic_tasks\sum.py) - sum of integers
+- [Arithmetic mean](statistic/Statistic_tasks/Arithmetic_mean.py) - the arithmetic mean of a given set of values function
+- [Greatest common divisor](statistic/Statistic_tasks/Greatest_common_divisor.py) - calculate the GSD
+- [Least common multiple](statistic/Statistic_tasks/Least_common_multiple.py) - calculate the LCM
+- [Median](statistic/Statistic_tasks/median.py) - the median function
+- [Multiplication tables](statistic/Statistic_tasks/multiplication_tables.py) - multiplication tables in the form of a table of 2 horizontal and 2 vertical values
+- [Number square root](statistic/Statistic_tasks/Number_square_root.py) -  the square root of the number function
+- [Range](statistic/Statistic_tasks/range.py) - the function of mathematical range
+- [Mean of numbers on a segment](statistic/Statistic_tasks/mean_of_nm_on_segment.py) - 
+- [Standard deviation](statistic/Statistic_tasks/Standard_deviation.py) - calculate the standard deviation of list
+- [Sum](statistic/Statistic_tasks/sum.py) - sum of integers