Lenny.com
Explore
Create
ActivitiesNewMathEnglish Language ArtsScience & EngineeringSocial StudiesGlobal LanguagesHealth & Physical EducationSpecial EducationCounseling & Life SkillsArts & CreativityESL
Lenny.com
Lenny.com
Explore
Create
ActivitiesNewMathEnglish Language ArtsScience & EngineeringSocial StudiesGlobal LanguagesHealth & Physical EducationSpecial EducationCounseling & Life SkillsArts & CreativityESL
Lenny.com
Lenny.com

Solutions

Lenny for EducatorsLenny for SchoolsLenny for Districts

Product

ExploreSign inCreateSupportAbout

Resources

Getting startedMTSS Acceleration Program

Newsletters

School Funding Newsletter

© 2026 Lenny Learning Inc.

TermsPrivacyAccessibility
LinkedInInstagramX
Lenny
MathNumbers & CountingCounting ObjectsNumber NamesComparing NumbersNumber OperationsCounting SequenceNumbers 0-10Place Value Understanding and SystemAdd and Subtract Within 20Addition and Subtraction ConceptsAddition and Subtraction EquationsAddition and Subtraction ProblemsFoundations for MultiplicationMultiplication and Division PropertiesMultiply and Divide Within 100Multiplication and Division ProblemsFactors and MultiplesProperties of OperationsPatterns and RelationshipsGenerate and Analyze PatternsMulti-Digit ArithmeticPlace Value OperationsMulti-Digit and Decimal OperationsNumerical ExpressionsFour Operations and PatternsFour Operations Problem SolvingMeasurement & DataMeasurable AttributesMeasuring LengthsMeasure and Estimate Lengths in Standard UnitsRelate Addition and Subtraction to LengthClassifying and Counting ObjectsTime and MoneyArea Concepts and MeasurementPerimeter and Area MeasuresAngle Concepts and MeasurementTime, Volume, and MassMeasurement Unit ConversionsGeometryIdentifying ShapesShapes and AttributesShape Attributes and ReasoningShapes and CompositionClassifying 2D FiguresGeometric Figures and RelationshipsLines, Angles, and ShapesAngle, Area, and VolumeGeometric MeasurementVolume of 3D ShapesCoordinate Plane ApplicationsTransformations in the PlaneCongruence and SimilarityUnderstand congruence in terms of rigid motionsSimilarity and TransformationsProve Theorems Involving SimilarityPythagorean TheoremTrigonometry for General TrianglesMake Geometric ConstructionsProve Geometric TheoremsTheorems About CirclesFind Arc Lengths And Areas of Sectors of CirclesVolume FormulasRelationships Between Two-Dimensional and Three-Dimensional ObjectsProve Simple Geometric Theorems AlgebraicallyTranslate Between Geometric Description and Equation for Conic SectionApply Geometric Concepts in Modeling SituationsFractions & DecimalsFractions as NumbersBuilding FractionsFraction Equivalence and OrderingAdding and Subtracting FractionsMultiplying and Dividing FractionsDividing FractionsDecimal FractionsMulti-Digit Computation and FactorsAdd, Subtract, Multiply, and Divide Rational NumbersRational Number SystemIrrational Numbers and ApproximationsRatiosRatios and ProportionsProportional RelationshipsUnit RateAlgebraAlgebraic ExpressionsGenerate Equivalent ExpressionsQuantitative RelationshipsProportional Relationships and Linear EquationsEquations and InequalitiesEquation Solving and ReasoningLinear Equations and SystemsGraph Equations and InequalitiesSystems of EquationsReal-World Algebraic ProblemsQuantitative Reasoning with UnitsExpression StructureEquivalent Expression FormsRadicals and Integer ExponentsRational ExponentsRational and Irrational NumbersPolynomial OperationsPolynomial IdentitiesPolynomial Zeros and FactorsRational ExpressionsComplex Number OperationsComplex Numbers in PolynomialsComplex Numbers on PlaneStatistics & ProbabilityRepresent and Interpret DataData DistributionsStatistical VariabilityProbability ModelsCompound Event ProbabilitiesStatistical SamplingInterpret Categorical and Quantitative DataBivariate Data PatternsInterpret Linear ModelsComparing Two PopulationsRandom Processes in StatisticsIndependence and Conditional ProbabilityExpected ValuesProbability-Based Decision MakingStatistical Inference and ConclusionsFunctionsFunction Concepts and NotationDefine and Compare FunctionsInterpret Functions in ContextAnalyze Function RepresentationsModel Relationships with FunctionsIdentify Linear vs Exponential GrowthDistinguish Between Function TypesCompare Growth RatesInterpret Function ExpressionsBuild Functions from RelationshipsConstruct and Model FunctionsTransform and Combine FunctionsModel Comparison and SelectionSolve Exponential EquationsTrigonometryTrigonometric Ratios Involving Right TrianglesTrigonometric Functions and Unit CircleModel with Trigonometric FunctionsTrigonometric IdentitiesVectors & MatricesIntroduction to Vectors and MatricesVector QuantitiesVector OperationsMatrix OperationsCalculusLimits and ContinuityDerivative Concepts and NotationDerivative Rules and TechniquesApplications of DerivativesOptimization ProblemsRelated RatesCurve Sketching and AnalysisIntegration Concepts and NotationAntiderivatives and Indefinite IntegralsDefinite Integrals and AreaFundamental Theorem of CalculusIntegration TechniquesApplications of IntegrationDifferential EquationsSequences and SeriesParametric and Polar FunctionsVector-Valued Functions

Number Grid Detectives Worksheet

A 2-page printable 2nd grade math worksheet where students act as number grid detectives, filling in missing numbers across rows (+1/-1) and columns (+10/-10) in 2-digit and 3-digit (hundreds) number grid puzzles. Includes a visual clue key, progressive 3x3 and 4x4 puzzles from the 20s through the 900s, high-contrast print-safe grid borders, and a short explanation prompt.

ISIsabella Schrump

Number Grid Detectives Worksheet

A 2-page printable 2nd grade math worksheet where students act as number grid detectives, filling in missing numbers across rows (+1/-1) and columns (+10/-10) in 2-digit and 3-digit (hundreds) number grid puzzles. Includes a visual clue key, progressive 3x3 and 4x4 puzzles from the 20s through the 900s, high-contrast print-safe grid borders, and a short explanation prompt.

ISIsabella Schrump

You might also like

Tens Builders A Assessment

Tens and Ones Mastery

A progress monitoring assessment suite for place value with numbers 11 to 29, covering representing tens and ones, counting grouped sets, and writing addition number sentences.

FF

Fiona Flannery

9
Ten Plus Equations A Assessment

Writing Addition Sentences

Three progress monitoring assessments measuring students' ability to represent quantities from 11 to 29, group tens and ones, and write matching addition number sentences.

FF

Fiona Flannery

3
Ten Plus Equations C Assessment

Ten Plus Equations C Assessment

Probe C progress monitoring assessment for Objective 3, featuring 8 numbers from 11 to 29 with blank workspaces for representing tens and ones and writing matching addition number sentences.

FF

Fiona Flannery

Seeing Pairs Worksheet

Pairs Patrol

A three-day gradual progression sequence introducing young learners to basic multiplication word problems using familiar, repeated groups of two. Students progress from visual pair models to student-drawn representations and independent story problem solving.

WA

Wildrem Andrade Matamoros

7
Group and Count A Assessment

Counting Tens and Ones

Three progress monitoring assessments measuring students' ability to organize 11 to 29 objects into tens and leftover ones, count the total, and write the number.

FF

Fiona Flannery

3
Ten Plus Equations B Assessment

Ten Plus Equations B Assessment

Probe B progress monitoring assessment for Objective 3, featuring 8 numbers from 11 to 29 with blank workspaces for representing tens and ones and writing matching addition number sentences.

FF

Fiona Flannery

Addition Intervention Teacher Guide

Tens and Ones Fluency

A targeted two-week second grade intervention unit designed to build fluency in adding and subtracting within 100. Emphasizes place value decomposition, properties of operations, and the relationship between addition and subtraction.

K

kkipperman

4
Tens Builders A Assessment

Representing Tens and Ones

Three progress monitoring assessments measuring students' ability to represent numbers 11 to 29 using cubes, dots, or tallies, group tens, and identify tens and leftover ones.

FF

Fiona Flannery

3
Ten Plus Equations A Assessment

Ten Plus Equations A Assessment

Probe A progress monitoring assessment for Objective 3, featuring 8 numbers from 11 to 29 with blank workspaces for representing tens and ones and writing matching addition number sentences.

FF

Fiona Flannery

Perspective Detectives Worksheet

Elementary Mastery Units

A collection of rigorous, standards-aligned elementary instructional units spanning literature analysis and foundational mathematics mastery.

T

tamara.delgado

4
Single Step Word Problems Worksheet

Locker Math Missions

A differentiated math word problem lesson featuring a shared operation key-word sort and two-page activities for single-step and two-step addition and subtraction, written at a 1st-grade reading level with middle-school-relevant contexts.

ES

Elizabeth Suther

3
Group and Count C Assessment

Group and Count C Assessment

Probe C progress monitoring assessment for Objective 2, featuring 8 sets of 11 to 29 objects for students to group into tens and ones, count, and write the total number.

FF

Fiona Flannery