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Interactive
CK-12 Foundation

Counting Techniques: Permutations and Combinations

For Students 11th - 12th
Comparing and contrasting is an important skill, even in mathematics. A drag-and-drop interactive has users classify situations as suitable for permutations or combinations. A set of challenge questions tests whether they know the...
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Worksheet
Curated OER

Vertical Subtraction (1)

For Students 5th - 7th
In this mathematical vertical subtraction activity, learners problem solve thirty subtraction equations for mastery of the skill of subtraction.
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Worksheet
Curated OER

Picture Subtraction #2

For Students Pre-K - K
In this subtraction worksheet, learners complete a set of 4 picture problems using numbers 1-5. A reference web site is given for additional activities.
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Worksheet
Curated OER

Simple Picture Subtraction

For Students K
In this picture subtraction worksheet, students solve one picture problem, 5-2. A reference web site is given for additional activities at the kindergarten level.
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Worksheet
Curated OER

Basic Subtraction Facts: Missing Blanks

For Students 1st - 2nd
For this math worksheet, students solve 20 subtraction problems in which there is a missing number in each. Students use the number line to fill in the missing number in each problem.
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Worksheet
Curated OER

Easy Subtraction

For Students K - 1st
In this easy subtraction worksheet, students solve 3 picture and numeric problems of 1-digit numbers. A website reference is given for additional resources. 
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Lesson Plan
Curated OER

Using Symbols to Subtract

For Teachers 1st
In this mathematics worksheet, 1st graders use symbols to subtract. They identify various symbols used when subtracting and explain why they may be used.
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Lesson Plan
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Using Addition to Subtract

For Teachers 3rd - 4th
In this using addition to subtract worksheet, learners, working with a partner, practice problem solving six word problems and equations.
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Worksheet
Curated OER

Systems of Equations - Problem Solving

For Students 9th - 12th
In this systems of equations worksheet, students translate word problems into algebraic equations.  They solve system of equations problems dealing with geometry, money, investment, angles and age problems.  This five-page worksheet...
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Worksheet
Curated OER

Add and Subtract Decimal Tenths (C)

For Students 4th - 7th
In this decimal addition and subtraction practice worksheet, learners sharpen their math skills as they solve 32 problems that require them to add and subtract decimal tenths.
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Worksheet
Curated OER

Subtract Mixed Numbers with Like Denominators (F)

For Students 5th
In this mixed number subtraction worksheet, 5th graders enhance their subtraction skills by solving the 7 mixed number equations with like denominators.
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Worksheet
Curated OER

Fact Families

For Students 1st - 2nd
In this addition and subtraction worksheet, students analyze a picture of sets of dots in two groups. Students write the addition and subtraction fact families to match the picture.
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Lesson Plan
Curated OER

Fact Families

For Teachers 1st
In this mathematics worksheet, 1st graders create a fact family that uses specific numbers given. Then they draw eight circles, add five more, and write the fact out in a problem.
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Worksheet
Curated OER

The Math Lesson 7

For Students K - 2nd
In this addition and subtraction practice instructional activity, students use their problem solving skills to solve 200 problems that require them to add and subtract single digit numbers.
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Lesson Plan
Curated OER

Book Title: You Can’t Buy a Dinosaur with a Dime

For Teachers 3rd - 4th
Students explore the concepts of multiple digit addition and subtraction. In this addition and subtraction lesson, students read the book You Can’t Buy a Dinosaur with a Dime and then discuss methods for solving a particular math problem...
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Lesson Plan
Curated OER

Easier Way to Subtract

For Teachers 2nd - 3rd
In this subtraction review worksheet, learners read about the Tic Tac Toe method for subtraction and then use the method to solve some problems.
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Worksheet
Curated OER

Take Away From 10

For Students K - 1st
In this subtract from ten activity students take away single digit numbers from ten to solve 20 equations with a fill in the blank sum.
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Worksheet
Curated OER

Mixed Operations

For Students 4th - 5th
For this mixed operations worksheet, students use the order of operations rule to help them solve the multiplication, division, addition, and subtraction problems.
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Worksheet
Curated OER

Subtract Fractions with Like Denominators (B)

For Students 5th - 6th
In this fraction subtraction worksheet, students practice subtracting fractions with like denominators. Students solve 24 fraction subtraction problems.
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Worksheet
Curated OER

Subtract Mixed Numbers with Like Denominators (D)

For Students 5th
In this mixed number subtraction learning exercise, 5th graders subtract the whole numbers in the mixed numbers and then the fractions. Students then reduce the fractions to solve the 14 equations.
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Worksheet
Curated OER

Subtract Mixed Numbers with Like Denominators

For Students 5th
In this mixed number subtraction worksheet, 5th graders subtract the whole numbers in the mixed numbers and then the fractions. Students then reduce the fractions to solve the 14 equations.
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Worksheet
Curated OER

Subtract Mixed Numbers with Like Denominators (H)

For Students 5th
In this mixed number subtraction worksheet, 5th graders subtract the whole numbers in the mixed numbers and then the fractions. Students then reduce the fractions to solve the 14 equations.
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Worksheet
Curated OER

Subtract Mixed Numbers with Like Denominators (G)

For Students 5th
In this mixed number subtraction worksheet, 5th graders rename the first mixed number. Students then subtract the whole numbers and fractions. Students solve 7 mixed number problems.
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Worksheet
Curated OER

Subtract Mixed Numbers with Like Denominators (I)

For Students 5th
In this mixed number subtraction worksheet, 5th graders rename the first mixed number. Students then subtract the whole numbers and fractions. Students solve 7 mixed number problems.