Problem : 4-2 = ?

1/16

Problem : 7-3 = ?

1/343

Problem : (- 6)-3 = ?

-1/216

Problem : (7/5)-2 = ?

25/49

Problem : (6/11)-1 = ?

11/6

Problem : Write out 3.0412 as single-digit numbers times powers of ten.

3×100 +0×10-1 +4×10-2 +1×10-3 +2×10-4