MATHEMATICS

(See also Numbers)

abacus: g71 11/22 17-20; g58 5/8 9-12

contests between electronic calculator and abacus: g80 8/22 31; g80 10/22 30; g78 12/22 19

addition: g62 1/8 15

Africa: g75 5/22 17-19

Babylonia: w56 300; g53 6/22 9

China:

method for rapid calculations mentally: g81 12/22 11; g80 5/22 31

circumference of circle: w66 319

computers: g66 5/22 16-19

decimal currency system: g65 1/8 10-11

division: g62 1/8 14-15

Egypt (ancient): g71 2/8 10; w56 300; g53 6/22 9

fractions: g62 1/8 14

Greece (ancient):

Pythagoras: g56 3/22 23; g47 10/22 26-28

Mayan: g66 2/22 13

multiplication: g62 1/8 12-14; g34 3/14 374-375; g30 4/30 498

children’s knowledge: g75 7/22 30

new math: g71 2/8 9-12

numbered squares with equal sums: g34 9/26 822-823

numerical systems: g71 2/8 11-12

odds against life originating by chance: ce 44-45, 47, 50; g63 4/22 4-5

origin of zero: w68 269; g68 1/22 23

proof of God’s existence: ce 36-37, 44-45, 47, 50; g74 5/22 22; g71 8/8 5; ev 37-38; w64 284

puzzles: g34 3/28 398

Roman numerals: g38 8/10 26; g30 8/20 753

sexagesimal system: g63 4/22 14

shortcuts: g62 1/8 12-15; g34 3/14 374-375

Soviet Union:

computers: g80 3/22 30

squaring mixed numbers: g34 1/31 274

subtraction: g62 1/8 15

Sumerians: ev 111; g63 4/22 14

trisecting angles: g37 12/15 16

use of, in everyday living: g75 9/22 29

value of: g65 12/8 14-15