CN204360647U - Rational number plus-minus method slipstick - Google Patents
Rational number plus-minus method slipstick Download PDFInfo
- Publication number
- CN204360647U CN204360647U CN201520041860.XU CN201520041860U CN204360647U CN 204360647 U CN204360647 U CN 204360647U CN 201520041860 U CN201520041860 U CN 201520041860U CN 204360647 U CN204360647 U CN 204360647U
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- China
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- slide rule
- continuous print
- axis ruler
- several continuous
- slipstick
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Abstract
The utility model discloses a kind of rational number plus-minus method slipstick, the slide rule (2) of this slipstick is between two scales, two scale one handles are auxiliary scale (1), another is number axis ruler (3), this auxiliary scale (1) one side is provided with addition, another side is provided with subtraction, the tow sides mid point of number axis ruler (3) and slide rule (2) is equipped with " 0 " number, establish several continuous print positive integer, negative integers respectively in the arranged on left and right sides adding normal plane slide rule (2) " 0 ", number axis ruler (3) is established the number contrary with slide rule (2) numeral; On subtraction face slide rule (2), the arranged on left and right sides of its " 0 " establishes several continuous print negative integer and positive integers respectively, number axis ruler (3) is established identical with slide rule (2) numeral.Twitch slide rule (2), two number consistencies from top to bottom on slide rule (2) and number axis ruler (3), the number on the slide rule (2) that " 0 " on number axis ruler (3) is right is total.Student is allowed to understand at a glance, easy to learn.
Description
Technical field
The utility model relates to slipstick, particularly a kind of rational number plus-minus method slipstick.
Background technology
This is across stage school year to rise up into junior middle school pupil from primary school, and to initial contact rational number, from recognizing calculating, definition rule is fuzzy, and understanding computing difficulty is large, is a qualitative leap.This has just risen up into the pupil in junior middle school from primary school, always like to take the plus and minus calculation of primary school mathematics to treat to the plus and minus calculation of rational number, they can not let go, and have sizable partial students to can not accept this new knowledge, produce mistake when calculating, the reason producing mistake is that conceptual understanding is not saturating.In the teaching of Junior Mathematics rational number plus and minus calculation, teacher is completely with public praise explanation, and in student's Reception learning, there is a lot of problem: 1, content abstraction, teacher is bad to be said, not easily allows student accept.2, directionality problem is abstracted in mathematics, this adds increased the difficulty that student understands problem, say as the student had: " teacher, can we verify the correctness of its conclusion by the mode of experiment ".So making a kind of instruments used for education of student's simple operations that can make is urgent problem.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of rational number plus-minus method slipstick, and classroom is simulated rational number plus-minus method computing method, and can verify the correctness of rational number plus-minus result, makes student very clear, understands at a glance, easy to learn.
The technical scheme that the utility model adopts is: rational number plus-minus method slipstick comprises two scales and slide rule, described slide rule is between two scales, described two scales one handle is auxiliary scale, another is number axis ruler, this auxiliary scale one side is provided with addition, another side is provided with subtraction, the tow sides mid point of described number axis ruler and slide rule is equipped with " 0 " number, the left side of " 0 " number of the slide rule of normal plane is added at described auxiliary scale, from " 0 ", be provided with several continuous print positive integers from small to large successively, the right side of its " 0 " number, from " 0 ", be provided with several continuous print negative integers from big to small successively, the left side of " 0 " number on the number axis ruler of normal plane is added at described auxiliary scale, from " 0 ", be provided with several continuous print negative integers from big to small successively, the right side of its " 0 " number, from " 0 ", be provided with several continuous print positive integers from small to large successively, on the slide rule in described auxiliary scale subtraction face, the left side of its " 0 ", from " 0 ", be provided with several continuous print negative integers from big to small successively, the right side of its " 0 ", from " 0 ", be provided with several continuous print positive integers from small to large successively, on the number axis ruler in described auxiliary scale subtraction face, the left side of its " 0 " number, from " 0 ", be provided with several continuous print negative integers from big to small successively, the right side of its " 0 " number, from " 0 ", is provided with several continuous print positive integers from small to large successively.
Improve as one of the present utility model: described slide rule is connected with two scales by " U " shape draw-in groove, and establishes web joint at the two ends of two scales.
The utility model rational number plus-minus method slipstick, one side is addition demonstration, and another side is subtraction demonstration.Twitch slide rule, two number consistencies from top to bottom on slide rule and number axis ruler, the number on the slide rule that " 0 " on number axis ruler is right is total.The utility model embodies the scientific knowledge principle mutually unified with scientific experimentation, calculating two rational numbers can be facilitated to add and subtract mutually, can verify again the correctness of its algorithm.By abstract knowwhy, objective reality ground experimental apparatus presents, clear, clear.This slipstick is drawn materials extensively, and make simple, rational in infrastructure, environmental protection low-carbon (LC), changeable, science is attractive in appearance, and emphasis is clear, easy to use, allows student really experience the importance done and test.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model rational number plus-minus method slipstick.
Fig. 2 is the rear view of Fig. 1.
Fig. 3 is that the A-A shown in Fig. 1 is to cut-open view.
Fig. 4 is the using state figure of the utility model rational number plus-minus method slipstick.
Fig. 5 is the another kind of using state figure of the utility model rational number plus-minus method slipstick.
Embodiment
As shown in Figure 1, Figure 2, Figure 3 shows, the utility model rational number plus-minus method slipstick comprises two scales and slide rule 2, described slide rule 2 is between two scales, described two scales one handle is auxiliary scale 1, another is number axis ruler 3, this number axis ruler 3 does not have direction compared with number axis, and the one side of auxiliary scale 1 is provided with addition, and another side is provided with subtraction.When auxiliary scale 1 is for adding normal plane, be " 0 " at the mid point of slide rule 2 and number axis ruler 3, from " 0 ", respectively to scales such as left and right separately, unit length is identical, and number axis ruler 3 is turned right, the number shown in each scale is increasing continuous positive integer, each scale of turning left to mark number be more and more less continuous negative integer, on each number on middle slide rule 2 and following number axis ruler 3, each corresponding number is all opposite number each other, and absolute value is equal; When auxiliary scale 1 is subtraction face, slide rule 2 and number axis ruler 3 are all the same number axis rulers, and this two chi does not indicate direction, and this two chi is all from mid point " 0 ", respectively wait scale separately to the right or left and unit length is identical, each number is up and down equal.Slide rule of the present utility model is connected with two scales by " U " shape draw-in groove, then with the two ends fix tightly of web joint by two scales, two scales are motionless, and the plus-minus only having slide rule to move left and right to realize rational number calculates.
The utility model it refer to number axis, the plus-minus of line segment and two each other opposite number and be zero the principles of science.
As shown in Figure 4, auxiliary scale 1 adds normal plane for demonstration rational number addition, number on slide rule 2 is "-3 ", number on number axis ruler 3 is "-4 ", and the number on the slide rule 2 that " 0 " on number axis ruler 3 is right is total "-7 ", and mathematical expression is (-3)+(-4)=-7.
As shown in Figure 5, auxiliary scale 1 subtraction face is demonstration rational number subtraction, number on slide rule 2 is "-1 ", number on number axis ruler 3 is "-6 ", and the number on the slide rule 2 that " 0 " on number axis ruler 3 is right is total "+5 ", and mathematical expression is (-1)-(-6)=+ 5.
Claims (2)
1. a rational number plus-minus method slipstick, it is characterized in that: this slipstick comprises two scales and slide rule (2), described slide rule (2) is between two scales, described two scales one handle is auxiliary scale (1), another is number axis ruler (3), this auxiliary scale (1) one side is provided with addition, another side is provided with subtraction, the tow sides mid point of described number axis ruler (3) and slide rule (2) is equipped with " 0 " number, the left side of " 0 " number of the slide rule (2) of normal plane is added at described auxiliary scale (1), from " 0 ", be provided with several continuous print positive integers from small to large successively, the right side of its " 0 " number, from " 0 ", be provided with several continuous print negative integers from big to small successively, the left side of number axis ruler (3) upper " 0 " number of normal plane is added at described auxiliary scale (1), from " 0 ", be provided with several continuous print negative integers from big to small successively, the right side of its " 0 " number, from " 0 ", be provided with several continuous print positive integers from small to large successively, on the slide rule (2) in described auxiliary scale (1) subtraction face, the left side of its " 0 ", from " 0 ", be provided with several continuous print negative integers from big to small successively, the right side of its " 0 " from, " 0 " starts, be provided with several continuous print positive integers from small to large successively, the left side of the number axis ruler (3) in described auxiliary scale (1) subtraction face upper " 0 " number, from " 0 ", be provided with several continuous print negative integers from big to small successively, the right side of its " 0 " number, from " 0 ", be provided with several continuous print positive integers from small to large successively.
2. rational number plus-minus method slipstick according to claim 1, is characterized in that: described slide rule (2) is connected with two scales by " U " shape draw-in groove, and establishes web joint at the two ends of two scales.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520041860.XU CN204360647U (en) | 2015-01-19 | 2015-01-19 | Rational number plus-minus method slipstick |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520041860.XU CN204360647U (en) | 2015-01-19 | 2015-01-19 | Rational number plus-minus method slipstick |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204360647U true CN204360647U (en) | 2015-05-27 |
Family
ID=53262103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520041860.XU Expired - Fee Related CN204360647U (en) | 2015-01-19 | 2015-01-19 | Rational number plus-minus method slipstick |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204360647U (en) |
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2015
- 2015-01-19 CN CN201520041860.XU patent/CN204360647U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150527 Termination date: 20180119 |