JPH0388084A - Calculation table - Google Patents

Abstract

PURPOSE:To form a multiplication/division table by drawing plural vertical and horizontal parallel lines on a plane and plotting plural proportional lines starting from an origin and intersecting with respective parallel lines. CONSTITUTION:Plural parallel lines Ba, Bb with equal intervals are drawn on the plane A respectively in the vertical and horizontal axis directions and scale marks are allocated. In addition, proportional lines intersecting with respective parallel lines are drawn correspondingly to respective scale marks. In the case of multiplication of 6X5, the horizontal coordinate of the intersecting point between the proportional line Bc connecting the scale mark 6 in the horizontal axis direction to the origin of the vertical axis direction 10 and the parallel line Ba of the vertical axis direction 5 is to be read out. When a ruler with scale marks is set up as a sliding cursor fa, the coordinate can easily be read out.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a calculation table used for multiplication and division calculations.

``Prior art and problems to be solved by the invention'' Currently, most multiplication and division operations are performed using calculators. In this case, calculations are performed by simply pressing a key, so there is no concern about the principle of study.

Furthermore, since conventional slide rules use a logarithmic scale, the calculation principle is difficult to understand, and their use is limited to specialized cases.

The present invention attempts to solve such problems.

"Means for Solving the Problem" In order to achieve the above-mentioned object, the present invention draws a plurality of parallel lines vertically and horizontally on a plane plate and marks them sequentially from the origin.

Furthermore, a plurality of proportional lines are arranged to intersect this origin and each parallel line.

``Action'' Because of the above configuration, for example, in the case of multiplication, the scale on the horizontal line at the intersection of the horizontal line and the proportional line that intersects with the horizontal scale is the same as the vertical scale corresponding to the position of the horizontal line, and the proportional line. It is the product of the scale.

In the case of division, conversely, the scale on the vertical line at the intersection of the vertical line and the proportional line that intersects it is the quotient of the horizontal scale divided by the scale of the proportional line, which corresponds to the position of the vertical line. Become.

In other words, calculations can be made immediately by simply looking at vertical lines, horizontal lines, and lines that intersect with these lines.

Embodiments The drawings show embodiments of the invention. In the figure, A
represents a flat plate, and B is a diagram expressed on the flat plate.

Diagram B is composed of a plurality of parallel lines arranged at equal intervals on both the vertical and horizontal axes, each marked with a scale, and a Philippine Cold War Bc intersecting each parallel line corresponding to the scale.

The scale may be set finely according to the purpose, and the range of the scale may be set as necessary for the purpose.

Also, parallel to the horizontal or vertical line, there is a scale corresponding to each scale (
Reading can be made even easier if a ruler-shaped object with a sliding cursor (fa) with finely divided cursors (which may be set finely as necessary) is provided as a sliding cursor (fa). This can also be done by applying them in parallel.

Note that this flat plate may be flexible.

"Effects of the Invention" According to the present invention, in multiplication and division, the desired answer can be found simply by reading along the corresponding line.

In particular, when learning multiplication tables, etc., the principle of multiplication (multiplication is determined by the number of times a certain number is added) can be easily understood, so it can be used as a teaching material.

[Brief explanation of drawings]

The drawing is a plan view showing an embodiment of the invention. A: Plane board B: Diagram Ba: Horizontal line Bb: Vertical line Bc: Proportional line fa: Cursor

Claims (1)

[Scope of Claims] A plurality of perpendicular parallel lines are drawn at equal intervals in the vertical and horizontal directions on a flat plate, and one of the intersections of these parallel lines is defined as the origin (0 point). Based on this, scales are attached vertically and horizontally. Further, the calculation sable is characterized in that a plurality of proportional lines are arranged from the origin and intersect with each parallel line so that the intersection points are equally spaced on any horizontal line.