Sebastian+and+Luke

1.= 5-4+3-2-1=1, 2.= 5-4+1=2 3.= 5-4+1+3-2=3 4.= 3-1+2=4 5.= 5-3+2+1=5 6.= 2X3+4-5+1=6 7.= 2X4-1=7 8.= 4X3-5+1=8 9.= 3+2+4=9 10.=5+4+2-1=10 11.= 5X2-3+4X1=11 12.= (5+4-3) X2X1=12 13.= 5+4+3-1+2=13 14.= 5+4+3+2+X1=14 15.= 5X3-3+2+1=15