| 单词 | number line |
| 释义 | > as lemmasnumber line number line n. Mathematics a graduated line representing the ordered set of real numbers (sometimes only the set of integers or natural numbers), used esp. to illustrate simple numerical concepts and operations. ΘΚΠ the world > relative properties > number > mathematical instruments > [noun] > arithmetical instrument mesograph1579 mesolabe1579 quipu1581 rods1618 Napier's bones1647 Napier's rods1678 reckoner1757 counter1803 adding machine1822 operameter1830 virgulaa1831 adder1856 computer1869 arithmometer1876 perforation gauge1882 Cuisenaire rod1954 number line1964 number cruncher1966 cruncher1971 1964 E. J. Swenson Teaching Arithm. to Children v. 99/1 When number lines are introduced to children, they should come in as a representation of a problem situation. 1968 P. J. Murphy & A. F. Kempf New Math. made Simple ii. 36 Since addition and subtraction are inverse operations, we expect subtraction to be associated with moving to the left on a number line. 1992 M. Field & M. Golubitsky Symmetry in Chaos v. 130 The real number line may be viewed as the horizontal x-axis in the complex plane. < as lemmas |
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