37,6 − 5,84 + 3,95 − 8,9 = 31,76 + 3,95 − 8,9 = 35,71 − 8,9 = 26,81
$\snippet{name: op_column, sign: '-', x: '37,60', y: '5,84', z: '31,76'}$
 
$\snippet{name: op_column, sign: '+', x: '31,76', y: '3,95', z: '35,71'}$
 
$\snippet{name: op_column, sign: '-', x: '35,71', y: '8,9', z: '26,81'}$

81 − 45,34 + 19,6 + 21,75 = 35,66 + 19,6 + 21,75 = 55,26 + 21,75 = 77,01
$\snippet{name: op_column, sign: '-', x: '81,00', y: '45,34', z: '35,66'}$
 
$\snippet{name: op_column, sign: '+', x: '35,66', y: '19,60', z: '55,26'}$
 
$\snippet{name: op_column, sign: '+', x: '55,26', y: '21,75', z: '77,01'}$

17,1 * 3,8 : 4,5 * 0,5 = 64,98 : 4,5 * 0,5 = 14,44 * 0,5 = 7,22
$\snippet{name: column_multiplication, x: 17.1, y: 3.8}$
 
$\snippet{name: long_division, x: 64.98, y: 4.5, decimal: true}$
 
$\snippet{name: column_multiplication, x: 14.44, y: 0.5}$

81,9 : 4,5 : 0,28 * 1,2 = 18,2 : 0,28 * 1,2 = 65 * 1,2 = 78
$\snippet{name: long_division, x: 81.9, y: 4.5, decimal: true}$
 
$\snippet{name: long_division, x: 18.2, y: 0.28, decimal: true}$
 
$\snippet{name: column_multiplication, x: 65, y: 1.2}$