math
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5
60
21 - 11 = 10
11 + 12 = 23
23 - 11 = 12
23 - 12 = 11
12 + 13 = 25
25 - 12 = 13
25 - 13 = 12
13 + 14 = 27
27 - 13 = 14
27 - 14 = 13
14 + 15 = 29
29 - 14 = 15
29 - 15 = 14
15 + 16 = 31
31 - 15 = 16
31 - 16 = 15
16 + 17 = 33
33 - 16 = 17
33 - 17 = 16
17 + 18 = 35
35 - 17 = 18
35 - 18 = 17
18 + 19 = 37
37 - 18 = 19
37 - 19 = 18
19 + 20 = 39
39 - 19 = 20
39 - 20 = 19
20 + 21 = 41
41 - 20 = 21
41 - 21 = 20
1 × 2 = 2
2 ÷ 2 = 1
2 × 3 = 6
6 ÷ 3 = 2
3 × 4 = 12
12 ÷ 4 = 3
4 × 5 = 20
20 ÷ 5 = 4
5 × 6 = 30
30 ÷ 6 = 5
6 × 7 = 42
42 ÷ 7 = 6
7 × 8 = 56
56 ÷ 8 = 7
8 × 9 = 72
72 ÷ 9 = 8
9 × 10 = 90
90 ÷ 10 = 9
10 × 11 = 110
110 ÷ 11 = 10
11 × 12 = 132
132 ÷ 12 = 11
12 × 13 = 156
156 ÷ 13 = 12
13 × 14 = 182
182 ÷ 14 = 13
14 × 15 = 210
210 ÷ 15 = 14
15 × 16 = 240
240 ÷ 16 = 15
16 × 17 = 272
272 ÷ 17 = 16
17 × 18 = 306
306 ÷ 18 = 17
18 × 19 = 342
342 ÷ 19 = 18
19 × 20 = 380
380 ÷ 20 = 19
20 × 21 = 420
420 ÷ 21 = 20
1 + ___ = 10
2 + ___ = 10
3 + ___ = 10
4 + ___ = 10
5 + ___ = 10
6 + ___ = 10
7 + ___ = 10
8 + ___ = 10
9 + ___ = 10
10 + ___ = 20
15 + ___ = 20
18 + ___ = 20
19 + ___ = 20
25 + ___ = 50
40 + ___ = 50
45 + ___ = 50
49 + ___ = 50
50 + ___ = 100
75 + ___ = 100
90 + ___ = 100
95 + ___ = 100
99 + ___ = 100
___ + 5 = 10
___ + 7 = 10
___ + 9 = 10
___ + 12 = 20
___ + 18 = 20
___ + 25 = 50
___ + 40 = 50