Answer:
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
Step-by-step explanation:
1x1=1 1x4=4
2x1=2 2x4=8
3x1=3 3x4=12
4x1=4 4x4=16
5x1=5 5x4=20
6x1=6 6x4=24
7x1=7 7x4=28
8x1=8 8x4=32
9x1=9 9x4=36
10x1=10 10x4=40
11x1=11 11x4=44
12x1=12 12x4=48
13x1=13 13x4=52
14x1=14 14x4=56
15x1=15 15x4=60
