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*TM 1-900

No. 1-900       }           

Washington, February 26,1943.


SECTION I. General -------------------   1-2
II. Fundamental operations -----------  3-19
III. Algebra ------------------------- 20-27
IV. Scales --------------------------- 28-31
V. Graphs ---------------------------- 32-36
VI. Angular measurement -------------- 37-40
VII. Vectors ------------------------- 41-49

APPENDIX. Miscellaneous units and conversion factors ---  80
INDEX --------------------------------------------------  83


Purpose and scope -------------------- 1
Materials ---------------------------- 2

1. Purpose and scope. -a. The purpose of this manual is to provide, in convenient form, a review of basic arithmetic and related subjects which members of an air crew must understand to practice simple air navigation and cope with other problems of the practical airman.

b. Briefly, the scope includes such elementary operations of arithmetic as addition, subtraction, multiplication, division, percentage, ratio proportion, angular measurements, scales, and the use of graphs and formulas, together with the graphical solution of some of the more common problems involving the triangle of velocity.

c. In mathematics, as in learning to fly, no amount of reading can replace actual practice. For this reason, many exercises have been included in each paragraph, and at the end of each section a collection of miscellaneous exercises has been added based on the material considered in that section. It is not contemplated that every student will do all of the exercises. However, an ample number of exercises has been inserted to provide an opportunity for those trainees who may feel the need for extra practice. The answers to the even numbered exercises are given to enable each student to check his own work if he wishes. Illustrative examples are profuse and should help to clarify difficult points which may arise.

[[footnote]]*This manual supersedes TM 1-900. April 22, 1942.[[/footnote]] 

[[footnote]] 509469-43---1 [[/footnote]]

[[stamp]] C.S. HAMMOND & CO. RETAIL MAP STORE 1 EAST 43 ST., R.Y.C. [[/stamp]]
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