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Across 6. A number that is multiplied by a variable in an algebraic expression 9. A value or values that make an equation true 10. An estimation technique in which the front digits of the addends are added

Down 1. An expression that contains at least one variable 2. A method used to estimate a sum when all addends are close to the same value 3. A method of writing very large or very small numbers by using powers of ten 4. A mathematical sentence that shows that two expressions are equivalent 5. A mathematical sentence that shows the relationship between two quantities that are not equal 7. A value that does not change 8. A symbol used to represent a quantity that can change