Update: This Lesson Is Part of Book 1 of Doodles Do Algebra: “Starting Out With Mental Algebra” available on Amazon.
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.
Available in the book, “Starting Out With Mental Algebra, Book 1 of Doodles Do Algebra”
- 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.
- 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.