Equation/Equivalent Sets/Estimate

EQUATIONA number sentence in which the equal sign = is used in an equation. Example: 6 + = 10 and 8 - 3 = are equations

EQUIVALENT SETSIf the members of two sets can be matched one to one, the sets are equivalent. Equivalent sets have the same number of members/elements.

ESTIMATEAn estimate is an approximate answer found by rounding numbers. Example: 22 + 39 = ,  22 may be rounded to 20, 39 may be rounded to 40. The estimated sum is 20 + 40 or 60

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