A B C
D
1 69,500.00 156,800.00 141,108.00 367,408.00
2 100,857.90 110,228.80 89,602.96 300,689.66
3 13,273.88 53,709.90 - 66,983.78
4 (44,631.78) (7,138.70) 51,505.04 (265.44)

A1-A2-A3=A4, B1-B2-B3=B4, C1-C2-C3=C4

A4+B4+C4=D4

When I add a check formula to verify that (D1-D2-D3=D4)=D4 I get an error
message. I found that although there are not an additional numbers beyond
the 2 decimal places seen in each cell, when I extend the decimal places of
C4 out to about 13 it shows 265.44000000000200 and D1-D2-D3=
265.44000000003100.
What is causing these decimal problems? The numbers in cells A1 thru C3
were typed in just as shown above with at most two decimal points.