CRCT Key Terms

Math

Angles An angle is formed by two rays or two

line segments that meet at a point. This point is called a vertex. (The plural of vertex is vertices.

There are four different kinds of angles.

right angle straight angle acute angle obtuse angle

Benchmark NumbersNumbers that help you estimate the number of objects without counting them, such as

25, 50. 100, and 1,000

Area• The number of square units needed

to cover a figure.

• To find the area of a figure, count the squares inside it.

• You add squares or multiply the number of squares across and the number going down to find area.

3 x 2 = 6 There are 8 sq units

Best Unit What would be the best unit

you can used to measure or weigh something with?ruler inches centimeters

scale millimeters meters

miles yard foot/feet

pounds

ounces

DifferenceThe answer in a subtraction problem

Example: 15 – 5 = 10

Difference

DigitsAny of these numerals: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

ClockwiseIn the directions in which the hands of a clock move

Hands move to the right

DataInformation collected then reviewed

Equal ToWhen both numbers are the same.

99 is equal to 99 or 99 = 99

EquivalentAnother word for equal to they mean the same thing.

38 is equivalent to 38 or 38 = 38

EstimateA number that is close to the exact answer

191 + 302 =439 exact answer

200 + 300 = 500 estimate answer

Even Number2, 4, 6 , 8, 10, 12, 14, 16, 18, 20…

Odd Numbers1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27

FactorA number being multiplied by another in a multiplication problem

Example: 3 x 4 = 12

factor factor

FractionA number that names a part of a whole or a part of a set

The top number is the numerator and the bottom number is the denominator.

¾ ½

Greater ThanWhen a number is larger than another number.

58 is greater than 32 or 58 > 32

Less ThanWhen a number is smaller than another number.

92 is less than 122 or 92 < 122

Lines of Symmetry

A C O M

MeasurementThe act of measuring or the process of being measured

Example: Length, Width, and Height

WidthHow wide an object is something

Width can be measured in: inches, yard, miles, millimeters, centimeters, meters, feet, and kilometers

HeightHow tall an object is.

Height can be measured in : inches and centimeters

LengthHow long and object is.

Length can be measured in: meters, millimeters, centimeters, miles, feet, and yards.

ModelIs a picture of something or

to show how to do something.

Money1 penny = 1 cent or $0.01

1 nickel = 5 cents or $0.05

1 dime = 10 cents or $0.10

1 quarter = 25 cents or $0.25

1 half dollar = 50 cents or $0.50

1 dollar ($) = 100 cents or $1.00

Number is Closest Number is Nearest To

The number that is identified is closest to a given numeral on a number line.

Ex. What number is 134 closest to?

125 150 175Answer is 150.

Number Line

0 1 2 3 4 5 6 7 8

Number Pattern2 4 6 8 10 1210 20 30 40 50 60

100 75 50 25200 400 600 800 1,000

12 17 23 28 32 37

Number Sentence

34 + 23 = 57

136 – 47 = 89

Number Sentence is Same As or

Which expression is the same

4 x 77 =

(4 x 7) + (4 x 70) =

OlderSam is older than I am. Sam is 12 and I am 11. Older is a greater number.

It is a bigger number.

radiusA line segment with one endpoint at the center of a circle and the other endpoint on the circle.

Millimeter (mm)A metric unit for measuring length or distance;

10 millimeters = 1 centimeter

1,000 millimeters = 1 meter

MultiplicationRepeated addition 3 + 3 + 3 + 3 = 12

3 x 4 = 12

DivisionTo separate into equal parts.

12 divided by 3 equals?

Ordinal Number

First, second, third, forth, fifth, sixth, seventh

1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th

Tally Chart

Same As

Solve

Value Equals

View As

Whole Number

Younger