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Understanding Addition: Key Concepts and Examples

This chapter delves into the fundamentals of addition, starting with the identification of addends, such as in the problem 875 + 413 = 1288. It emphasizes the importance of estimating sums, demonstrated with 56 + 95, where an estimate would be 60 + 100 = 160. The chapter also clarifies critical terms including "expression," which comprises numbers and operation signs without yielding a sum, as well as "number sentence," which incorporates both numbers and operation symbols, culminating in an answer. Additionally, it explains the "not equal to" symbol, highlighting the distinction between different numeric values.

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Understanding Addition: Key Concepts and Examples

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  1. Chapter Four Addition

  2. sum - the answer to an addition problem 875 + 413 1, 288 (is the sum)

  3. 2. addends – the numbers you add together 181 + 254 = 435 181 and 254 are the addends.

  4. 3. estimate – find out about how much or how many 56 + 95 The estimate would be 60 + 100 = 160

  5. 2. expression – part of a number sentence that combines numbers and operation signs Ex. 44 + 52 The expression does not include the sum or difference.

  6. 3. number sentence – sentence that includes numbers, operation symbols or a relation symbols Example: 5 + 3 =8 A number sentence does include the answer!!

  7. 5. not equal to – ( = ) relation symbol used to show that two numbers are not equal to each other Ex. $18 = $26 4 + 3 = 7 but 4 – 3 = 7

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