CONTENTS . xi

ARTICLE PAGE
" 460. Lazy man’s rule for multiplication . 5 5 ; & L
463. Multiplying on the fingers . Z . . 3 : . . 180
Finger rule for multiplication . 5 : : : L8]

467. Mechanical devices for multiplication : 2 ; o 182
470. Russian peasant, or binary, method of multlpllcatxon : : == 385
472. Generalized binary rule for multiplication. 2 : 3 . 186
473. Ternary rule for multiplication . . 5 = : : =187
475. A queer property of numbers . S s : 2 . . 188
477. Other curious properties of numbers . 3 : 2 : 0 A
487. The Chuquet-Baker egg problem . 5 202

488. The problem of the dishonest men, the monkeys and the
coconuts . ; : : . 5 s : . > 25203