4 × 1 = 4
4 × 2 = 8
4 × 3 = 12
4 × 4 = 16
4 × 5 = 20
4 × 6 = 24
4 × 7 = 28
4 × 8 = 32
4 × 9 = 36
4 × 10 = 40
4× 11 = 44
4 × 12 = 48
4 × 13 = 52
4 × 14 = 56
4 × 15 = 60
4 × 16 = 64
4 × 17 = 68
4 × 18 = 72
4 × 19 = 76
4 × 20 = 80