NB Grade 7 Math flashcards
NB Grade 7 Math · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Integer
- A whole number that can be positive, negative, or zero, with no fractional or decimal part; for example, -3, 0, and 7 are integers.
- Absolute value
- The distance of a number from zero on a number line, always zero or positive; the absolute value of -5 is 5.
- Opposite integers
- Two integers the same distance from zero but on opposite sides of zero, such as 4 and -4; their sum is zero.
- Order of operations
- The agreed sequence for evaluating expressions: brackets first, then exponents, then multiplication and division from left to right, then addition and subtraction from left to right.
- Divisibility rule for 3
- A whole number is divisible by 3 when the sum of its digits is divisible by 3; for example, 123 has digit sum 6.
- Equivalent fractions
- Fractions that name the same value, made by multiplying or dividing the numerator and denominator by the same nonzero number; for example, 1/2 equals 2/4.
- Unit rate
- A rate with a denominator of 1, showing the amount per single unit; for example, 120 km in 3 hours gives 40 km per hour.
- Proportion
- An equation stating that two ratios are equal; if a/b = c/d and b and d are nonzero, then ad = bc.
- Percent
- A ratio out of 100; 35% means 35 per 100, which equals 0.35 or the fraction 35/100.
- Reciprocal
- The number that multiplies a given nonzero number to give 1; the reciprocal of 3/4 is 4/3, and the reciprocal of 5 is 1/5.
- Terminating decimal
- A decimal that ends after a finite number of digits; in lowest terms, its denominator has only 2 and 5 as prime factors.
- Linear relation
- A relationship whose graph is a straight line and whose rate of change is constant; it can be written in the form y = mx + b.
- Variable
- A letter or symbol that represents an unknown or changing number in an expression or equation, such as x in 3x + 2.
- Equation
- A mathematical statement that two expressions are equal, containing an equals sign; solving it means finding values that make the statement true.
- Coefficient
- The number multiplying a variable in a term; in 7x the coefficient is 7, and in -2y the coefficient is -2.
- Like terms
- Terms with exactly the same variable part; they can be combined by adding or subtracting their coefficients, as in 3x + 5x = 8x.
- y-intercept
- The point where a line crosses the y-axis, which occurs when x = 0; in the equation y = mx + b, the y-intercept is b.
- Circumference
- The distance around a circle; it is calculated as C = πd or C = 2πr, using π approximately equal to 3.14.
- Area of a circle
- The amount of space inside a circle, measured in square units and calculated as A = πr², where r is the radius.
- Volume
- The amount of space a three-dimensional object occupies, measured in cubic units; for a rectangular prism, volume equals length times width times height.
- Surface area
- The total area of all faces or surfaces of a three-dimensional object, measured in square units and found by adding the areas of every face.
- Diameter
- A line segment through a circle's center with both endpoints on the circle; its length is twice the radius.
- Translation
- A transformation that slides every point of a figure the same distance and direction; shape, size, and orientation stay unchanged.
- Reflection
- A transformation that flips a figure over a line to produce a mirror image; corresponding points remain the same distance from the line.
- Rotation
- A transformation that turns a figure around a fixed center point by a given angle; shape and size stay unchanged.
- Congruent
- Figures with exactly the same shape and size; corresponding sides and angles are equal, and translations, reflections, and rotations preserve congruence.
- Ordered pair
- Two numbers written as (x, y) that give a point's horizontal and vertical positions on a coordinate plane; the origin is (0, 0).
- Mean
- The average of a data set, found by adding all values and dividing by the number of values; for 2, 4, and 6, the mean is 4.
- Median
- The middle value when data are ordered from least to greatest; with an even number of values, it is the mean of the two middle values.
- Mode
- The value that appears most often in a data set; a data set may have one mode, several modes, or no mode at all.
- Probability
- A number from 0 to 1 that measures how likely an event is, calculated as favorable outcomes divided by total equally likely outcomes.
- Complement
- The event that a given event does not happen; its probability equals 1 minus the probability of the given event.