1.8 + 9 = 172 + 8 = 106 + 2 = 88 + 6 = 145 + 2 = 7
2.2 + 4 = 67 + 5 = 127 + 1 = 85 + 5 = 103 + 3 = 6
3.2 + 7 = 99 + 7 = 165 + 9 = 142 + 5 = 78 + 8 = 16
4.5 + 3 = 84 + 6 = 106 + 8 = 143 + 7 = 104 + 2 = 6
5.9 + 1 = 107 + 8 = 156 + 7 = 136 + 1 = 76 + 4 = 10
6.8 + 6 = 147 + 9 = 162 + 5 = 75 + 5 = 102 + 2 = 4
7.1 + 7 = 82 + 1 = 37 + 9 = 161 + 8 = 98 + 3 = 11
8.7 + 4 = 112 + 6 = 87 + 3 = 105 + 6 = 113 + 5 = 8
9.1 + 2 = 33 + 1 = 45 + 7 = 121 + 5 = 60 + 7 = 7
10.3 + 4 = 74 + 9 = 134 + 3 = 71 + 4 = 59 + 9 = 18
11.7 + 7 = 144 + 8 = 123 + 2 = 53 + 8 = 113 + 6 = 9
12.5 + 3 = 85 + 9 = 142 + 8 = 105 + 8 = 135 + 1 = 6
13.1 + 5 = 68 + 3 = 118 + 5 = 133 + 1 = 47 + 4 = 11
14.7 + 8 = 152 + 9 = 116 + 6 = 128 + 2 = 104 + 5 = 9
15.1 + 3 = 43 + 6 = 97 + 2 = 94 + 1 = 56 + 5 = 11
16.4 + 8 = 125 + 4 = 94 + 6 = 102 + 9 = 116 + 8 = 14
17.9 + 2 = 116 + 9 = 154 + 9 = 138 + 9 = 179 + 3 = 12
18.2 + 4 = 67 + 5 = 127 + 3 = 103 + 0 = 36 + 1 = 7
19.8 + 8 = 168 + 4 = 126 + 3 = 93 + 2 = 55 + 7 = 12
20.2 + 3 = 58 + 1 = 96 + 3 = 99 + 1 = 102 + 1 = 3

answers to this test: jakeholland.net/multest.php?vals=0-9&op=add&seed=1899568201&answer

random multiplication test: /multest.php?vals=0-9&op=mul
random division test: /multest.php?vals=0-9&op=div
random addition test: /multest.php?vals=0-9&op=add
random subtraction test: /multest.php?vals=0-9&op=sub