かけ算18の段(18の倍数)

18 × 1 = 18
18 × 2 = 36
18 × 3 = 54
18 × 4 = 72
18 × 5 = 90
18 × 6 = 108
18 × 7 = 126
18 × 8 = 144
18 × 9 = 162
18 × 10 = 180
18 × 11 = 198
18 × 12 = 216
18 × 13 = 234
18 × 14 = 252
18 × 15 = 270
18 × 16 = 288
18 × 17 = 306
18 × 18 = 324
18 × 19 = 342
18 × 20 = 360
18 × 21 = 378
18 × 22 = 396
18 × 23 = 414
18 × 24 = 432
18 × 25 = 450
18 × 26 = 468
18 × 27 = 486
18 × 28 = 504
18 × 29 = 522
18 × 30 = 540

18は360を20等分した値。角度の問題などでよく出てくる。