how do i work it out

3:98= (the 98 does not fit into the 3. We describe it as 0)

3:98=0 (since we can't calculate in the area of whole numbers, we go into the decimal places by adding a "point/dot".)

3:98=0. (now we enlarge the 3 with zero and get 30:98=0.)

3:98=0. (30 still isn't large enough to contain 98. We mark this fact with another 0)

3:98=0.0 (and at the same time we we add the 0 on the left side of the "=" and get a number large enough to perform the task 300:98=3)

3:98=0.03 (3*98=294; now we subtract 300-294=6 and give it an additional 0 for the next decimal place 60:98=)

3:98=0.030 (since 98 does not fit into 60 we mark this fact with a 0 on the right side of "=". At the same time we add the 0 to the left side of "=". We get 600:98=6)

3:98=0.0306 (the decimal places can be calculated endlessly; 6*98=588; subtract 600-588=12, add 0 to both sides 120:98=1)

3:98=0.03061 (1*98=98; 120-98=22; 220:98=2;)

3:98=0.030612 (2*98=196; 220-196=24; add 0 for the next decimal place 240:98=2)

3:98=0.0306122 (2*98=196; 240-196=44; add 0 for the next decimal place 440:98=4)

3:98=0.03061224 (4*98=392; 440-392=48; add 0 for the next decimal place 480:98=4)

3:98=0.031 (rounded)