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Round each number to the nearest hundred. Subtract the rounded numbers. Mental math can often be used to complete estimates. At this grade level, however, errors can be more easily identified if students write down their work when estimating answers.

As students gain experience and confidence estimating sums and differences, point out that estimates can often be used to check computations.

Students should realize that if both addends are rounded up, the estimated sum will be greater than the actual sum, and if both addends are rounded down, the estimated sum will be less than the actual sum.

Such generalizations are not possible with subtraction. Expressions and Equations An arithmetic expression consists of numbers, grouping symbols, and operation symbols. An algebraic expression is like an arithmetic expression, but contains at least one variable.

A variable is a letter that represents a number. When evaluating expressions at this grade level, students are told to first evaluate within parentheses and then complete the evaluation from left to right.

An algebraic expression is evaluated by substituting a given value for the variable and then simplifying the resulting arithmetic expression. The equality of two expressions gives an equation.

If two expressions are not equal, an inequality is created. When one side of an equation contains the variable and the other side contains a number, the equation can be solved. To solve an equation means to find the value of the variable that will make the equation true.

The equations in this chapter are simple enough to be solved by inspection, by using related number sentences, or by using a guess-and-check strategy. Sometimes an equation may have two variables. In this case, a function table is used to find pairs of numbers that make the equation true.

Students will learn more about evaluating expressions and solving equations in future chapters.Similarly, a number sentence is a group of numbers that includes a mathematical operation -- think of addition, subtraction, multiplication, or division -- along with either an inequality .

I’m curious if D.C.’s algorithm has been challenged under a disparate impact theory for recommending release more often for white people than black people – facially-similar algorithms have been challenged on such grounds in the past. The worksheets contain skills based on writing multiplication sentences, describing models, completing equations and drawing models.

Equal groups, arrays, area and number lines are the four models used in the worksheets. Reporting Category Number and Number Sense and Computation and Estimation Topic Modeling multiplication of fractions Primary SOL The student will demonstrate multiple representations of.

The module culminates with multi-step addition and subtraction word problems in Topic F (4 5 ones.) On your personal white boards, write the number. S: (Students do so.) T: Show more.

S: (Students write ,) Possible further sequence: 10, less, , more, 1 less, 10 more. draw a model, write equations both to estimate and. Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum.

For K kids, teachers and parents. Show Ads. Hide Ads About Ads. Estimation (Introduction) Estimation is a Skill for Life. Estimation Tips and Tricks Visual Estimation Estimation Games Numbers Index.

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how to do ballpark estimate in elementary math? | Yahoo Answers