Ext 6-8 Sampler

38 Skill Builders ©MathTeachersPress, Inc. Reproduction only for one teacher for one class. Name____________________________________ Skill Builders 50-2 WritingExpressions Algebraic expressionsmay be shownwith rectangular rods and black andwhite cubes. The rectangular rods represent the unknown variable. The black andwhite cubes represent the positive and negative integers. Example: is written as: 2 n + 3 Example: is written as: 3 n – 4 Write the algebraic expression for each picture. Use n to represent the unknown. 1. __________ 3. __________ 5. __________ 7. __________ 2. __________ 4. __________ 6. __________ 8. __________ 9. six times a number increased by 2 __________ 11. six times a number plus the number __________ 13. the sum of 3 times a number and 5 __________ 15. 2 times a number decreased by 4 __________ 17. 3 times a number divided by 4 __________ 19. the sum of the following: a number, 2 times a number and 4 __________ 10. twice a number less 4 __________ 12. 3 times a number divided by 6 __________ 14. 4 times a number less 7 __________ 16. 5 groups of a number plus 2 __________ 18. 4 plus 3 times a number __________ 20. the difference between 2 times a number and 4 __________ Write an algebraic expressionwith n for eachword phrase. 7.EE.4 ©MathTeachersPress, Inc. Reproduction only for one teacher for one class. Name ____________________________________ Skill Builders50-3 An equation can bewritten fromwords. x + 8 = 15 WritingEquations fromModels orWords An equation is amathematical sentencewith an equal sign. The equal sign tells you that one side of the equation is equal to the other side if it is a true equation. = Write an equation for eachmodel. Use x ( ) as the variable. 1. ___________________________ 3. ___________________________ 2. ___________________________ 4. ___________________________ 5. A number decreased by 10 is 15. _____________________________________ 7. Six times a number is 54. _____________________________________ 9. The product of 6 and a number is 72. _____________________________________ 11. Twice a number is 24. _____________________________________ 13. Eight less than a number is 10. _____________________________________ 15. Two less than a number is 33. _____________________________________ 17. The sum of 8 and a number is 24. _____________________________________ 19. Three plus a number is 25. _____________________________________ 6. Three times a number is 81. _____________________________________ 8. Thirty-fivedecreasedbyanumber is20. _____________________________________ 10. The quotient of a number and 4 is 12. _____________________________________ 12. The difference of a number and5 is15. _____________________________________ 14. The sum of a number and 6 is 24. _____________________________________ 16. The sumof 5andanumber is 12. _____________________________________ 18. Theproduct of 3andanumber is9. _____________________________________ 20. Two timesanumber is52. _____________________________________ = = = = Pedro added $8 to his bank account. He then had $15 in his bank account. Howmuch did he have in his account in the beginning? bank account + $8 = $15 x +$8 = $15 x =$7 An equation can be written from amodel. 7.EE.4 Correlations toCCSS, CCSS-CA, or TEKSare shownat bottom of eachSkill Builder page in thematchingTeacherManual. Skill Builders provide extra practice forall objectives. Grade7