CK-12 Foundation
Ck 12: Algebra: Problem Solving Models
[Free Registration/Login may be required to access all resource tools.] Solve real- world problems involving a problem solving plan
CK-12 Foundation
Ck 12: Algebra: Simplify Sums or Differences
[Free Registration/Login may be required to access all resource tools.] Simplify sums or differences of single variable expressions by combining like terms.
CK-12 Foundation
Ck 12: Arithmetic: Estimation of Sums of Mixed Numbers and Fractions
[Free Registration/Login may be required to access all resource tools.] Estimate sums and differences of fractions and mixed numbers
CK-12 Foundation
Ck 12: Arithmetic: Mental Math to Add and Subtract Decimals
[Free Registration/Login may be required to access all resource tools.] Find sums and differences of decimals using mental math.
CK-12 Foundation
Ck 12: Elem Math: Sums of Whole Numbers to 1000 (Grade 3)
[Free Registration/Login may be required to access all resource tools.] This site offers the video "Addition: 3 Digits." and a practice quiz in which students solve problems using addition to find the sum or summand of numbers up to 1000.
Soft Schools
Soft Schools: Integers and Real Numbers Quiz
Students are expected to evaluate the sum, difference, product, quotient, and the absolute value of real numbers and integers. Also, they must know the concepts of positive and negative numbers.
CK-12 Foundation
Ck 12: Algebra: Comparison of Problem Solving Models
[Free Registration/Login may be required to access all resource tools.] Solve real-world problems using selected strategies as part of a problem solving plan
CK-12 Foundation
Ck 12: Arithmetic: Decimal Rounding to Estimate Sums and Differences
[Free Registration/Login may be required to access all resource tools.] Estimate sums and differences by rounding decimals to whole numbers.
CK-12 Foundation
Ck 12: Arithmetic: Expressions for the Product of a Number and a Sum
[Free Registration/Login may be required to access all resource tools.] Write numerical expressions to describe the product of a number and a sum of numbers
CK-12 Foundation
Ck 12: Arithmetic: Mental Math to Evaluate Products
[Free Registration/Login may be required to access all resource tools.] Evaluate numerical expressions using mental math.
CK-12 Foundation
Ck 12: Analysis: Series Sums and Gauss' Formula
[Free Registration/Login may be required to access all resource tools.] In this lesson students will be calculating the sums of the terms in a series. Students examine guided notes, review guided practice, watch instructional videos and...
CK-12 Foundation
Ck 12: Analysis: Sums of Finite Geometric Series
[Free Registration/Login may be required to access all resource tools.] Calculating the sums of finite geometric series
CK-12 Foundation
Ck 12: Analysis: Sums of Infinite Geometric Series
[Free Registration/Login may be required to access all resource tools.] Calculating the sum of the values in an infinite geometric series
CK-12 Foundation
Ck 12: Arithmetic: Sums of Integers With the Same Sign
[Free Registration/Login may be required to access all resource tools.] In this lesson students find the sum of integers with the same sign. Students examine guided notes, review guided practice, watch instructional videos and attempt...
CK-12 Foundation
Ck 12: Arithmetic: Sums of Integers Using Absolute Value
[Free Registration/Login may be required to access all resource tools.] In this lesson students add two or more integers using absolute value. Students examine guided notes, review guided practice, watch instructional videos and attempt...
CK-12 Foundation
Ck 12: Arithmetic: Estimation of Whole Number
[Free Registration/Login may be required to access all resource tools.] Round whole numbers in order to estimate sums and differences.
CK-12 Foundation
Ck 12: Arithmetic: Expression Evaluation With Fractions
[Free Registration/Login may be required to access all resource tools.] Evaluate numerical expressions involving sums and differences of fractions.
CK-12 Foundation
Ck 12: Arithmetic: Differences of Integers Using a Number Line
[Free Registration/Login may be required to access all resource tools.] Use a number line to find the differences of integers.
CK-12 Foundation
Ck 12: Algebra: Simplify Variable Expressions
[Free Registration/Login may be required to access all resource tools.] Simplify variable expressions involving multiple operations
CK-12 Foundation
Ck 12: Algebra: Simplify Variable Expressions
[Free Registration/Login may be required to access all resource tools.] Evaluate and simplify variable expressions that involve integer addition
CK-12 Foundation
Ck 12: Algebra: Inverse Property of Addition in Fraction Equations
[Free Registration/Login may be required to access all resource tools.] Identify and apply the inverse property of addition in fraction operations
CK-12 Foundation
Ck 12: Arithmetic: Estimation of Sums of Mixed Numbers and Fractions
[Free Registration/Login may be required to access all resource tools.] Estimate sums of fractions and mixed numbers
CK-12 Foundation
Ck 12: Elem Math: Calculating Sums Numbers Up to 100000
[Free Registration/Login may be required to access all resource tools.] Students use place value to practice with addition skills.
National Council of Teachers of Mathematics
Nctm: Figure This: Which Is Worth More, a Smile or a Frown?
Solve for the value of the smiles and frowns to find out how much a smile is worth, in this activity. A challenge that focuses on number sense, number combinations, and unknowns. Included are examples of how this skill is applied in real...