Answer 2:1+2+3-4× 5+6× 7+8× 9 =100.

Answer 3:1+2-3× 4+5× 6+7+8× 9 =100.

Answer 4:1+2-3× 4-5+6× 7+8× 9 =100.

Answer 5:1+2× 3+4× 5-6+7+8× 9 =100.

Answer 6:1+2× 3× 4× 5 ÷ 6+7+8× 9 =100

Answer 7:1-2+3× 4× 5+6× 7+8-9 =100.

Answer 8:1-2+3× 4× 5-6+7× 8-9 =100.

Answer 9:1-2× 3+4× 5+6+7+8× 9 =100.

Answer10:1-2× 3-4+5× 6+7+8× 9 =100.

Answer11:1-2× 3-4-5+6× 7+8× 9 =100.

Answer12:1× 2× 3+4+5+6+7+8× 9 =100.

Answer13:1× 2× 3-4× 5+6× 7+8× 9 =100.

Answer14:1× 2× 3× 4+5+6+7× 8+9 =100.

Answer15:1× 2× 3× 4+5+6-7+8× 9 =1001+-3-4+5x (6+7+8).