2015 Mathematics Curriculum Terminology

Vocabulary flashcards covering core curriculum terms across Grade 1, Grade 2, and Grade 3 mathematics from the 2015 curriculum framework.

2015

The revision year of the national mathematics curriculum framework outlined across the grade levels in the document.

회전˝

Solid of revolution; a three-dimensional geometric solid formed by revolving a plane figure 360^\\text{circ} around a straight line, categorized under Grade 1 three-dimensional figures.

회전⁄

Axis of revolution; the fixed reference line around which a two-dimensional figure is rotated to produce a solid of revolution, categorized under Grade 1 three-dimensional figures.

구

Sphere; a perfectly round three-dimensional geometric body where every point on the surface is located at an equal distance from the center, categorized under Grade 1 three-dimensional figures.

전‡

Net or development; an unfolded flat two-dimensional plane pattern that can be folded to construct a three-dimensional solid, categorized under Grade 1 geometry.

겉˚

Surface area; the total measurement of the area that covers the outer faces or surface of a three-dimensional solid, categorized under Grade 1 three-dimensional geometry.

ó피

Volume; the quantitative measure of the three-dimensional space enclosed within a solid object, categorized under Grade 1 three-dimensional geometry.

줄Ø 잎 ’림

Stem-and-leaf plot; a graphical display used to organize quantitative data by separating each data value into a leading digit (stem) and a trailing digit (leaf), categorized under Grade 1 statistics.

히Ó토’램

Histogram; a statistical graph consisting of adjacent rectangles whose bases represent class intervals and whose heights represent class frequencies, categorized under Grade 1 statistics.

무°

Infinite decimal; a decimal number whose fractional part continues endlessly without terminating, categorized under Grade 2 numbers and operations.

ÿ마디

Repeating period (repetend); the minimal repeating sequence of digits that recurs infinitely in a repeating decimal, categorized under Grade 2 numbers and operations.

à£õ 덧셈

Addition of polynomials; the algebraic operation of combining two or more polynomial expressions by summing their corresponding like terms, categorized under Grade 2 algebraic expressions.

뺄셈

Subtraction; the algebraic operation of taking away one quantity or polynomial from another by reversing signs and collecting like terms, categorized under Grade 2 algebraic expressions.

전

Expansion; the mathematical operation of multiplying out products of algebraic expressions to express them as a sum of terms, categorized under Grade 2 algebraic expressions.

가감ª

Method of addition and subtraction (elimination method); an algebraic technique for solving systems of linear equations by adding or subtracting equations to eliminate a variable, categorized under Grade 2 systems of equations.

x편

$x$-intercept; the $x$-coordinate of the point where the graph of a function crosses or touches the $x$-axis, where $y = 0$, categorized under Grade 2 linear functions.

y편

$y$-intercept; the $y$-coordinate of the point where the graph of a function crosses or touches the $y$-axis, where $x = 0$, categorized under Grade 2 linear functions.

마ıî

Rhombus; an equilateral quadrilateral whose four sides are all congruent in length, categorized under Grade 2 properties of geometric figures.

확률

Probability; the numerical value measuring the likelihood of a specific event occurring, categorized under Grade 2 probability.

실

Real number; any value that can be represented on a continuous one-dimensional number line, comprising both rational and irrational numbers, categorized under Grade 3 numbers and operations.

무

Irrational number; any real number that cannot be represented as a ratio of two integers and possesses a non-terminating, non-repeating decimal expansion, categorized under Grade 3 numbers and operations.

완전®©õ

Perfect square expression; an algebraic polynomial that can be expressed as the square of another polynomial, such as $(a + b)^2$, categorized under Grade 3 polynomial multiplication and factoring.

포물

Parabola; the symmetrical planar curve formed by graphing a quadratic function, categorized under Grade 3 quadratic functions.

빗À

Hypotenuse; the longest side in a right-angled triangle, situated directly opposite the right angle, categorized under Grade 3 trigonometric ratios.

높

Height; the perpendicular distance from the base of a geometric figure to its opposite vertex, categorized under Grade 3 trigonometric ratios.

ãù

Sine; the trigonometric function defined in a right-angled triangle as the ratio of the length of the opposite side to the length of the hypotenuse, denoted as $\sin(\theta)$, categorized under Grade 3 trigonometry.

코ãù

Cosine; the trigonometric function defined in a right-angled triangle as the ratio of the length of the adjacent side to the length of the hypotenuse, denoted as $\cos(\theta)$, categorized under Grade 3 trigonometry.

탄젠트

Tangent; the trigonometric function defined in a right-angled triangle as the ratio of the length of the opposite side to the length of the adjacent side, denoted as $\tan(\theta)$, categorized under Grade 3 trigonometry.

현

Chord; a straight line segment whose endpoints both lie on the boundary curve of a circle, categorized under Grade 3 circle geometry.

편

Deviation; the numerical difference between an individual data observation and the arithmetic mean of the data set, categorized under Grade 3 statistics.

“준편

Standard deviation; a fundamental statistical measure of the dispersion or spread of values around their mean, equal to the square root of the variance, categorized under Grade 3 statistics.