Answer:
column 1
5 × 98
33 x 12
3 x 6
100 x .1
8 x (3/4)
3×7
4×2
column 2
5(100-2)
33(10+2)
3(10-4)
100(0.06+0.04)
8(1/2+1/4)
3(3+4)
4(6-4)
column 3
5×100-5×2
33×10+33×2
3×10-3×4
100×0.04×100×0.06
8×1/2+8×1/4
3×3+3×4
4×6-4×4
column 4
500-10
330+66
30-12
4+6
4+2
9+12
24-16
value
490
396
18
10
6
21
8
the last row could also be 8x1