1.4 + 2 = 64 + 3 = 72 + 9 = 112 + 5 = 78 + 6 = 14
2.5 + 6 = 113 + 6 = 95 + 6 = 115 + 7 = 121 + 5 = 6
3.9 + 4 = 132 + 9 = 113 + 9 = 122 + 8 = 108 + 4 = 12
4.2 + 1 = 33 + 5 = 82 + 2 = 49 + 8 = 176 + 2 = 8
5.7 + 3 = 109 + 3 = 121 + 4 = 59 + 3 = 128 + 8 = 16
6.7 + 1 = 88 + 1 = 90 + 6 = 64 + 1 = 56 + 8 = 14
7.9 + 9 = 189 + 6 = 157 + 2 = 95 + 4 = 99 + 5 = 14
8.5 + 5 = 106 + 0 = 64 + 0 = 41 + 2 = 38 + 3 = 11
9.8 + 6 = 147 + 8 = 158 + 2 = 103 + 9 = 124 + 1 = 5
10.8 + 9 = 172 + 2 = 46 + 6 = 124 + 6 = 107 + 4 = 11
11.7 + 7 = 141 + 1 = 27 + 7 = 142 + 4 = 61 + 9 = 10
12.3 + 7 = 101 + 3 = 45 + 3 = 86 + 9 = 157 + 9 = 16
13.9 + 1 = 101 + 7 = 87 + 8 = 151 + 6 = 78 + 3 = 11
14.9 + 4 = 135 + 1 = 66 + 8 = 149 + 2 = 113 + 3 = 6
15.7 + 1 = 81 + 2 = 35 + 9 = 147 + 6 = 131 + 8 = 9
16.2 + 5 = 75 + 4 = 96 + 1 = 72 + 6 = 86 + 5 = 11
17.6 + 6 = 123 + 2 = 58 + 5 = 138 + 5 = 131 + 6 = 7
18.7 + 4 = 117 + 6 = 136 + 1 = 76 + 4 = 104 + 9 = 13
19.3 + 7 = 107 + 5 = 125 + 8 = 135 + 2 = 74 + 7 = 11
20.4 + 5 = 90 + 4 = 46 + 3 = 92 + 3 = 58 + 9 = 17

answers to this test: jakeholland.net/multest.php?vals=0-9&op=add&seed=843477430&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