Doodles Do Algebra – Lesson 9

kindle-book-coverUpdate: This Lesson Is Part of Book 1 of Doodles Do Algebra: “Starting Out With Mental Algebra” available on Amazon.

 

Teacher’s Notes:

DoodleCat pretty well explains the problems for today so I think I just need to provide the answers. The problems are essentially like the ones in Lesson 8, but your child just gets more practice.

 

Worksheet:

Available in the book, “Starting Out With Mental Algebra, Book 1 of Doodles Do Algebra”

 

Answers:

  1. first number = x, and second number = 2x + 5, then Sum = 35 = x + 2x + 5. Now Solve for x: 35 = 3x + 5, then 35-5 = 3x, then 30 = 3x, then x=10. So, first number = 10 and second number = 25.
  2. smaller flock = x, and larger flock = 5x + 5, then total = 83 = x + 5x + 5. Now Solve for x: 83=6x + 5, then 83-5 = 6x, then 78 = 6x, then x=78/6, or x=13 (it is very helpful here to know your 13 times tables). So the smaller flock has 13 sheep, and the larger flock has 70 sheep.