Arithmetic (also see 9.3)

Remedial or Developmental? Confusion over Terms,  Don Ross,  1:2,  1970, 
27-31,  1.2
Two-Pan Weighings,  Chris Burditt,  3:2,  1972,  80-81,  C
Cyclically Permuted Code: A Variation on Binary Arithmetic,  J. Maurice
Kingston,  5:1,  1974,  29-36
Computation of Repeating Decimals, James E. McKenna, 7:2, 1976, 55-58
Smith Numbers, A. Wilansky, 13:1, 1982, 21, 9.3
Cryptology: From Caesar Ciphers to Public-Key Cryptosystems, Dennis Luciano and
Gordon Prichett, 18:1, 1987, 2-17, 7.2, 9.3
What's Significant about a Digit?, David A. Smith, 20:2, 1989, 136-139, C, 9.6
FFF #85. Unto Everyone That Hath Shall Be Given, John W. Kenelly, 26:1, 1995, 36, F
Number Words in English, Steven Schwartzman, 26:3, 1995, 191-195
The Mathematical Judge: A Fable, William G. Frederick and James R. Hersberger, 26:5, 1995, 377-381, 1.1
The Square of Any Odd Number is the Difference Between Two Triangular Numbers (Proof Without Words), Roger B. Nelsen, 27:2, 1996, 118, C, 9.3
Fractions with Cycling Digit Patterns, Dan Kalman, 27:2, 1996, 109-115, 9.3
FFF #112. United in Purpose, Bruce Yoshiwara, 28:2, 1997, 119, F
FFF #121. A Case of Black and White - But Not So Much Black, Peter Rosenthal, 28:5, 1997, 377, F
FFF #125. Effects of Changing Temperature, Dave Trautman, 29:1, 1998, 35, F
More Coconuts, Sidney H. Kung, 29:4, 1998, 312-313, C, 9.3
More Coconuts, Sidney H. Kung, 29:4, 1998, 312-313, C, 9.3
FFF #138.  Fifty per cent more for fifty per cent less, Norton Starr, 30:1, 1999, 39-40, F
Interval Arithmetic and Analysis, James Case, 30:2, 1999, 106-111, 9.5
FFF #140.  Whose Real World?, Elizabeth Berman Appelbaum, 30:2, 1999, 130, F
FFF #144.  Spoiled for Choice, Norton Starr, 30:3, 1999, 210, F, 3.2
Saving Digits, Mark McKinzie, 31:2, 2000, 146, C