Billy's addition
7+9=17
7+9=16
5-3=3
5-3=2
4 x 8=36
4 x 8=32
9 / 3 = 6
9 / 3 = 3
74-8=76
74-8=66
43+8+50
43+8+51
28-9=20
28-9=19
7 x 9 = 62
7 x 9 = 63
81 / 3 = 270
81 / 3 = 27
282-26=56
282-26=256
87+6=813
97+6+ 93
63-9=69
63-9=54
11 x 5 = 50
11 x 5 = 55
48 / 8 = 8
48 / 8 =6
66 / 3 = 21.1
66 / 3 = 22
34+72=96
34+72=106
48-16=42
48-16=32
12 x 13 = 29
12 x 13 = 156
144 / 12 = 120
144 / 12 = 12
420 x 8 = 3260
420 x 8 = 3360
158+24=172
158=182
371-58=323
371-58=313
156 x 58 = 2028
(Hint- the same mistake has been made in a previous question)
156 x 58 = 9048
225 / 25 = 90
225 / 25 = 9
671+948 = 1519
671+948=1619