Hickey, Preston Langley: Parlor Problems ©1920 Preston Langley Hickey, Augsburg Publishing House, MN Softcover, saddle-stitched, 5.5x8.5", 29 pages plus ads

Image courtesy eBay seller MagicCollectiblesPlus

Comments: "Or Mental Mathematical Magic". Some demonstration of lightning math and some math gags/tricks.

Contents (from book):

7 Introduction

9 Chapter One the Basic Number: the number 9

11 Chapter Two Lightning Addition: quick addition of 5 four digit numbers
14 Lightning Multiplication: starting with 99
15 Cross Out Number Trick: magicina determines which figure was crossed out
18 Multiplication Extraordinary: interesting multiplication experiment
19 Forty Five From Forty Five: puzzle
20 The Mental Number Trick: mathematical trick to divine the number thought of
20 A Salary Increase: comedy math trick

24 Chapter Three
24 The Cannibals and the White Men: puzzle to get all across the river safely

28 Afterword

29 Jewels of Magic: advertisement section