42 + 18
24 + 36
59 + 18
32 + 49
99 − 61
66 − 55
63 − 44
98 − 17
17 + 71
23 + 32
43 + 38
74 + 26
98 − 73
89 − 37
53 − 42
88 − 83
42 + 18 = (40 + 10) + (2 + 8) = 50 + 10 = 60
$\snippet{name: op_column, sign: '+', x: '42', y: '18', z: '60'}$
24 + 36 = (20 + 30) + (4 + 6) = 50 + 10 = 60
$\snippet{name: op_column, sign: '+', x: '24', y: '36', z: '60'}$
59 + 18 = (50 + 10) + (9 + 8) = 60 + (9 + 1 + 7) = 60 + (10 + 7) = 60 + 10 + 7 = 70 + 7 = 77
$\snippet{name: op_column, sign: '+', x: '59', y: '18', z: '77'}$
32 + 49 = (30 + 40) + (2 + 9) = 70 + (1 + 1 + 9) = 70 + (1 + 10) = 70 + 10 + 1 = 80 + 1 = 81
$\snippet{name: op_column, sign: '+', x: '32', y: '49', z: '81'}$
99 − 61 = (90 + 9) − (60 + 1) = (90 − 60) + (9 − 1) = 30 + 8 = 38
$\snippet{name: op_column, sign: '-', x: '99', y: '61', z: '38'}$
66 − 55 = (60 + 6) − (50 + 5) = (60 − 50) + (6 − 5) = 10 + 1 = 11
$\snippet{name: op_column, sign: '-', x: '66', y: '55', z: '11'}$
63 − 44 = (50 + 13) − (40 + 4) = (50 − 40) + (13 − 4) = 10 + 9 = 19
$\snippet{name: op_column, sign: '-', x: '63', y: '44', z: '19'}$
98 − 17 = (90 + 8) − (10 + 7) = (90 − 10) + (8 − 7) = 80 + 1 = 81
$\snippet{name: op_column, sign: '-', x: '98', y: '17', z: '81'}$
17 + 71 = (10 + 70) + (7 + 1) = 80 + 8 = 88
$\snippet{name: op_column, sign: '+', x: '17', y: '71', z: '88'}$
23 + 32 = (20 + 30) + (3 + 2) = 50 + 5 = 55
$\snippet{name: op_column, sign: '+', x: '23', y: '32', z: '55'}$
43 + 38 = (40 + 30) + (3 + 8) = 70 + 11 = 70 + 10 + 1 = 80 + 1 = 81
$\snippet{name: op_column, sign: '+', x: '43', y: '38', z: '81'}$
74 + 26 = (70 + 20) + (4 + 6) = 90 + 10 = 100
$\snippet{name: op_column, sign: '+', x: '74', y: '26', z: '100'}$
98 − 73 = (90 + 8) − (70 + 3) = (90 − 70) + (8 − 3) = 20 + 5 = 25
$\snippet{name: op_column, sign: '-', x: '98', y: '73', z: '25'}$
89 − 37 = (80 + 9) − (30 + 7) = (80 − 30) + (9 − 7) = 50 + 2 = 52
$\snippet{name: op_column, sign: '-', x: '89', y: '37', z: '52'}$
53 − 42 = (50 + 3) − (40 + 2) = (50 − 40) + (3 − 2) = 10 + 1 = 11
$\snippet{name: op_column, sign: '-', x: '53', y: '42', z: '11'}$
88 − 83 = (80 + 8) − (80 + 3) = (80 − 80) + (8 − 3) = 0 + 5 = 5
$\snippet{name: op_column, sign: '-', x: '88', y: '83', z: '5'}$
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