1.5 + 9 = 146 + 9 = 151 + 1 = 24 + 8 = 128 + 7 = 15
2.1 + 3 = 48 + 9 = 172 + 3 = 57 + 2 = 91 + 5 = 6
3.1 + 9 = 108 + 6 = 142 + 9 = 115 + 7 = 128 + 1 = 9
4.4 + 1 = 52 + 7 = 95 + 7 = 129 + 3 = 129 + 9 = 18
5.1 + 2 = 36 + 6 = 129 + 6 = 154 + 0 = 49 + 4 = 13
6.8 + 4 = 121 + 7 = 83 + 8 = 110 + 1 = 17 + 7 = 14
7.4 + 9 = 137 + 2 = 93 + 2 = 56 + 7 = 131 + 6 = 7
8.7 + 9 = 167 + 6 = 137 + 8 = 150 + 7 = 74 + 5 = 9
9.8 + 8 = 165 + 2 = 76 + 1 = 79 + 5 = 144 + 3 = 7
10.6 + 8 = 149 + 7 = 167 + 4 = 111 + 0 = 17 + 1 = 8
11.0 + 8 = 82 + 7 = 98 + 3 = 113 + 3 = 65 + 4 = 9
12.8 + 5 = 133 + 5 = 81 + 5 = 64 + 2 = 66 + 8 = 14
13.3 + 3 = 67 + 5 = 125 + 3 = 81 + 4 = 56 + 5 = 11
14.1 + 3 = 49 + 9 = 182 + 4 = 64 + 8 = 122 + 0 = 2
15.1 + 8 = 97 + 5 = 122 + 9 = 116 + 6 = 126 + 2 = 8
16.3 + 6 = 99 + 2 = 115 + 8 = 134 + 6 = 106 + 4 = 10
17.5 + 8 = 135 + 5 = 105 + 3 = 83 + 5 = 89 + 6 = 15
18.6 + 7 = 133 + 8 = 111 + 1 = 24 + 0 = 49 + 7 = 16
19.7 + 3 = 103 + 6 = 98 + 4 = 127 + 6 = 139 + 8 = 17
20.6 + 4 = 100 + 2 = 28 + 9 = 173 + 4 = 74 + 1 = 5

answers to this test: jakeholland.net/multest.php?vals=0-9&op=add&seed=634188475&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