Mental arithmetic level 1

These are not interactive exercises -you need pen and paper to write your answers down.

Adding two whole numbers	Adding and subracting with a number ending in '9'	Dividing whole numbers by 10, 100, ...	Multiplying decimals by 0.1, 0.01,....
Subracting two whole numbers	Multiplying and dividing by 10 and 100	Comparing two decimals	Multiplying one whole number by one decimal
Multiplication Tables	Multiplying two whole numbers	Adding two decimal numbers	Multiplying two decimal numbers
Whole number division	Multiplying by '5'	Subracting two decimals	Dividing decimals by 10, 100,...
Division with remainders	Decimals and fractions	Multiplying decimals by 10, 100, ...	Writing fractions