35894 + 7068 − 9408;
(90 + 1) * 100 − 64 : 4;
98888 + (60100 − 7302);
90 + 1 * (100 − 64) : 4.

35894 + 7068 − 9408 = 42962 − 9408 = 33554
$\snippet{name: op_column, sign: '+', x: 35894, y: 7068, z: 42962}$
$\snippet{name: op_column, sign: '-', x: 42962, y: 9408, z: 33554}$
(90 + 1) * 100 − 64 : 4 = 91 * 100 − 64 : 4 = 9100 − 16 = 9084
98888 + (60100 − 7302) = 98888 + 52798 = 151686
$\snippet{name: op_column, sign: '-', x: 60100, y: 7302, z: 52798}$
$\snippet{name: op_column, sign: '+', x: 98888, y: 52798, z: 151686}$
90 + 1 * (100 − 64) : 4 = 90 + 36 : 4 = 90 + 9 = 99