Question

i have to show if the number is a solution or not. 4 through 9

Answer 1

4: No (2 x 4=8+7=16)
5: Yes (-6 x 5= -30 +10=-20)
6: Yes (27 / 3=9 - 7=2)
7: Yes (5 x 4=20 + -8=12)
8: No ( -16/-4= -4 + 3=-1)
9: Yes (3/4 x 20/1=60/4=15)