Cheat sheet

Praxis 5003 Math Cheat Sheet

Quick Facts

Exam
Praxis 5003
Full name
Elementary Ed Math Subtest
Part of
Praxis 5001 battery
Questions
50 (some unscored)
Time
65 minutes
Formats
Multiple choice + numeric entry
Calculator
On-screen scientific (TI-30XS)
Score scale
100-200
Passing score
Set by your state
Fee
$64 alone; $180 for 5001
Retake
28-day wait
Scores valid
10 years

Order of Operations

Please Excuse My Dear Aunt Sally

ParenthesesExponentsMultiply/divide left to rightAdd/subtract left to rightM and D tie

Factor vs Multiple

Factor

  • Divides into it
  • Short finite list
  • GCF questions

Multiple

  • Number times integer
  • Infinite list
  • LCM questions

Smaller than vs larger than

Word Problem Operation Picker

  1. Joining equal groupsMultiply(Repeated addition)
  2. Sharing into equal groupsDivide(How many each)
  3. How many fit insideDivide(How many groups)
  4. Combining unequal amountsAdd
  5. Finding the differenceSubtract(Comparison)
  6. Fraction of an amountMultiply(of means times)
  7. Percent of a numberMultiply by decimal
  8. Cost for one unitDivide(Unit rate)
  9. Leftover people still travelRound quotient up

Place Value

Place
Position of the digit
Value
Digit times its place
Standard form
234
Expanded form
200 + 30 + 4
Word form
Two hundred thirty-four
Powers of ten
2×10² + 3×10¹ + 4×10⁰
One place left
Ten times greater
One place right
One-tenth as much
Rounding
Check the digit right
Round up when
That digit is ≥ 5

Dividing Fractions

Keep, Change, Flip

Keep the first fractionChange ÷ to ×Flip the second fractionThen multiply across

Place vs Value

Place

  • Name of position
  • Tens, hundreds, tenths
  • Same for any digit

Value

  • Digit times place
  • 400 inside 3,472
  • Changes per digit

Position vs worth

Fraction Rules

Add or subtract
Common denominator first
Multiply
Numerators and denominators straight across
Divide
Multiply by the reciprocal
Reciprocal
Flip numerator and denominator
Unit fraction
Numerator equals 1
Bigger denominator
Smaller piece
Mixed to improper
Whole × denominator + numerator
Improper to mixed
Divide; remainder over denominator
Simplify
Divide both by GCF
Compare fractions
Same whole required
Benchmarks
Compare to 0, ½, 1

Percent Setup

Part over whole equals percent over 100

Cross multiply to solvePercent change: change ÷ originalof means multiply

Ratio vs Rate

Ratio

  • Same units
  • 3 boys to 2 girls
  • Part to part

Rate

  • Different units
  • 60 miles per hour
  • Unit rate per one

Same units vs different

Decimals + Percents

Fraction to decimal
Divide numerator by denominator
Decimal to percent
Multiply by 100
Percent to decimal
Divide by 100
Percent to fraction
Put over 100, simplify
1/4
0.25 = 25%
1/3
0.333... ≈ 33.3%
3/8
0.375 = 37.5%
2/3
0.666... ≈ 66.7%
1/8
0.125 = 12.5%
Percent of a number
Multiply by the decimal
Percent change
Change ÷ original × 100
30% off
Pay 70% of price

First Primes

2, 3, 5, 7, 11, 13, 17, 19

2 is only even prime1 is not primeComposite: more than two

Ratio and Proportion

Ratio
Compares two quantities
Rate
Ratio with different units
Unit rate
Amount per one unit
Proportion
Two equal ratios
Cross multiply
ad = bc
Percent setup
part/whole = percent/100
Percent means
Rate per 100
Ratio 3:2, total 20
12 and 8
$6.99 per 20 ounces
About $0.35 per ounce
Scale factor
Multiplier between similar figures

Number Theory

Prime
Exactly two factors
Composite
More than two factors
1
Neither prime nor composite
2
Only even prime
Factor
Divides evenly into it
Multiple
Number times a whole number
GCF
Largest shared factor
LCM
Smallest shared multiple
Prime factorization
36 = 2² × 3²
GCF signal
Splitting into equal groups
LCM signal
Events lining up again
First primes
2, 3, 5, 7, 11

Divisibility Rules

By 2
Last digit is even
By 3
Digit sum divisible by 3
By 4
Last two digits divisible
By 5
Ends in 0 or 5
By 6
Passes both 2 and 3
By 8
Last three digits divisible
By 9
Digit sum divisible by 9
By 10
Ends in 0

Properties of Operations

Commutative
Order changes, result same
Associative
Grouping changes, result same
Distributive
a(b + c) = ab + ac
Additive identity
Adding 0 changes nothing
Multiplicative identity
Multiplying by 1
Additive inverse
Sums to 0
Multiplicative inverse
Product is 1
Zero property
Product is always 0
Not commutative
Subtraction and division

Estimation Checks

Front-end
Use the leading digits
Compatible numbers
Round to easy pairs
Reasonableness
Does the size fit
Decimal check
Estimate catches misplaced point
Rounded answer choices
Never round midway
Remainder up
Buses, boxes, tables needed
Remainder down
Complete groups you make
Remainder shared
Answer is a fraction

Expression vs Equation

Expression

  • No equal sign
  • Simplify or evaluate
  • 3x + 5

Equation

  • Has equal sign
  • Solve for variable
  • 3x + 5 = 20

Simplify vs solve

Equation Setup Picker

  1. Says is or totalsEquation(Equal sign)
  2. Says at least, at mostInequality
  3. Variable on both sidesCollect like terms
  4. Parentheses in the problemDistribute first
  5. Two related quantitiesInput-output table
  6. Same amount added repeatedlyArithmetic pattern
  7. Same multiplier each stepGeometric pattern

Algebra Vocabulary

Expression
No equal sign
Equation
Has an equal sign
Inequality
Uses < > ≤ ≥
Term
Piece separated by signs
Coefficient
Number multiplying the variable
Constant
Term with no variable
Leading coefficient
Coefficient of highest power
Like terms
Same variable, same exponent
Independent variable
The input you choose
Dependent variable
The output that results
Evaluate
Substitute, then compute

Independent vs Dependent

Independent

  • Input value
  • You control it
  • Bottles bought

Dependent

  • Output value
  • Result of input
  • Total cost

Cause vs effect

Words into Algebra

Sum of
Add
Difference of
Subtract
Product of
Multiply
Quotient of
Divide
Twice a number
2n
A number increased by 6
n + 6
6 less than a number
n − 6
At least
At most
Is, equals, totals
Equal sign
Per, each
Divide or unit rate

Solving Equations

Goal
Isolate the variable
Step 1
Distribute, clear parentheses
Step 2
Combine like terms
Step 3
Undo adding or subtracting
Step 4
Undo multiplying or dividing
Balance rule
Same operation both sides
Check
Substitute back into original
Flip inequality
Multiply or divide by negative
Open circle
< or >, not included
Closed circle
≤ or ≥, included

Patterns and Sequences

Arithmetic
Add a common difference
Geometric
Multiply a common ratio
aₙ = a₁ + (n − 1)d
Arithmetic term formula
Common difference
Term minus previous term
Function rule
Output from every input
Table rule
Must fit every row
Shape pattern
Repeating or growing
Conjecture
Prediction from a pattern

Metric Stairs

King Henry Died By Drinking Chocolate Milk

kilo, hecto, dekabase unitdeci, centi, milliEach step is ×10

Area vs Perimeter

Area

  • Space inside
  • Square units
  • Multiply dimensions

Perimeter

  • Distance around
  • Linear units
  • Add all sides

Cover it vs fence it

Formula Picker

  1. Fencing around a gardenPerimeter(Linear units)
  2. Carpet covering a floorArea(Square units)
  3. Water filling a tankVolume(Cubic units)
  4. Paper wrapping a boxSurface area(Add the faces)
  5. L-shaped figure givenDecompose into rectangles
  6. Only a net shownAdd every face
  7. Dimensions all doubledVolume ×8(Area ×4)

Shapes, Angles, Coordinates

Acute angle
Less than 90°
Right angle
Exactly 90°
Obtuse angle
Between 90° and 180°
Straight angle
Exactly 180°
Triangle angles
Add to 180°
Quadrilateral angles
Add to 360°
Parallel lines
Never meet
Perpendicular lines
Meet at 90°
Equilateral
Three equal sides
Isosceles
At least two equal
Scalene
No equal sides
Parallelogram
Two pairs parallel sides
Rhombus
Four equal sides
Trapezoid
One pair parallel sides
Origin
(0, 0)
Ordered pair
(x, y): across then up
Quadrant I
x positive, y positive
Quadrant order
Counterclockwise from upper right

Center and Spread

Mean average, Median middle, Mode most

Median: order firstMode: appears mostRange: max − min

Volume vs Surface Area

Volume

  • Space inside solid
  • Cubic units
  • length × width × height

Surface area

  • Outside covering
  • Square units
  • Add all faces

Fill it vs wrap it

Measure of Center Picker

  1. One extreme outlierMedian(Resists extremes)
  2. Data roughly symmetricMean(Uses every value)
  3. Need most commonMode(Works for categories)
  4. Data is categoricalMode
  5. Need spread onlyRange(Maximum minus minimum)
  6. Total mattersMean(Sum drives it)

Area and Perimeter

Perimeter
Add all side lengths
Rectangle area
length × width
Rectangle perimeter
2l + 2w
Square area
side × side
Square perimeter
4 × side
Triangle area
½ × base × height
Parallelogram area
base × height
Trapezoid area
½ × (b₁ + b₂) × h
Height
Perpendicular to the base
Composite figure
Split into rectangles, triangles
Area units
Square units
Perimeter units
Linear units
Diameter
2 × radius
Circumference
π × diameter
Circle area
π × radius²

Mean vs Median

Mean

  • Sum ÷ count
  • Uses every value
  • Outliers pull it

Median

  • Middle after ordering
  • Position based
  • Outliers barely matter

Balance point vs middle

Graph Picker

  1. Compare separate categoriesBar graph
  2. Show change over timeLine graph
  3. Show parts of wholeCircle graph(Totals 100%)
  4. Show numeric frequency rangesHistogram(Bars touch)
  5. Show two-variable relationshipScatterplot(Trend direction)
  6. Small data setLine plot(Dot plot)
  7. Show median and quartilesBoxplot

Volume and Surface Area

Rectangular prism volume
length × width × height
Cube volume
side × side × side
Prism surface area
2(lw + lh + wh)
Net
Unfolded three-dimensional figure
Surface area from net
Add every face area
Cube faces
Six equal squares
Volume units
Cubic units
Fractional edge lengths
Formula still works
Double every dimension
Area ×4, volume ×8

Unit Conversions

1 foot
12 inches
1 yard
3 feet = 36 inches
1 mile
5,280 feet
1 cup
8 fluid ounces
1 pint
2 cups
1 quart
2 pints = 4 cups
1 gallon
4 quarts = 16 cups
1 pound
16 ounces
1 ton
2,000 pounds
1 kilometer
1,000 meters
1 meter
100 centimeters
1 centimeter
10 millimeters
1 liter
1,000 milliliters
1 kilogram
1,000 grams
1 gram
1,000 milligrams
1 hour
60 minutes
Elapsed time
Count up in chunks
Small unit to large
Divide
Large unit to small
Multiply
Blueprint scope
Convert within one system

Measures of Center

Mean
Sum ÷ number of values
Median
Middle of ordered list
Even-count median
Average the two middles
Mode
Most frequent value
Range
Maximum − minimum
No mode
Every value appears once
Outlier
Value far from others
Outlier effect
Mean moves, median resists
Skewed data
Median describes center better
Statistical question
Expects varying answers
Add a high value
Mean rises, range widens

Graphs and Probability

Bar graph
Compares separate categories
Line graph
Change over time
Circle graph
Parts of one whole
Histogram
Frequency by numeric interval
Line plot
Dots above number line
Boxplot
Five-number summary
Scatterplot
Two variables, possible trend
Double bar graph
Compares two data sets
Probability
Favorable ÷ total outcomes
Impossible event
Probability 0
Certain event
Probability 1
Complement
1 − P(event)
Independent events
Multiply the probabilities
Theoretical probability
Counted, not experimental

Common Traps

Multiplying does not enlarge

Multiply can shrink Divide can grow

Area vs perimeter

Area covers inside Perimeter goes around

Mean vs median

Mean follows outliers Median resists outliers

Place vs value

Place is position Value is worth

Triangle height

Height is perpendicular Slant side is longer

Percent of vs off

30% of is 0.30 30% off is 0.70

Doubling every dimension

Area multiplies by four Volume multiplies by eight

Order of operations

Multiply-divide left to right Not multiply before divide

Less than wording

6 less than n Not 6 − n

Adding fractions

Common denominator first Never add denominators

Converting units

Small to large divides Large to small multiplies

Inequality sign

Negative multiply flips Positive multiply keeps

Last Minute

  1. 1.Numbers 40%, Algebra 30%, Geometry 30%
  2. 2.50 questions in 65 minutes
  3. 3.On-screen scientific calculator provided
  4. 4.Passing score set by state
  5. 5.Divide fractions: keep, change, flip
  6. 6.Percent change: change ÷ original
  7. 7.Area = square units; perimeter = linear
  8. 8.Volume = length × width × height
  9. 9.Triangle area = ½ base height
  10. 10.Triangle angles sum to 180°
  11. 11.Mean follows outliers; median resists
  12. 12.1 gallon = 4 quarts = 16 cups
  13. 13.GCF splits groups; LCM repeats
  14. 14.Multiplying by fraction can shrink
  15. 15.Flip inequality when multiplying negative
  16. 16.Estimate first, then trust calculator
Same family resources

Explore More Praxis Exams

Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.