Ray's New Primary Arithmetic · Lesson LXIII · Unit 6: Division
63. Finding the price of one
Goal: Your child finds the cost of one item from the cost of several, then the cost of a different number.
You'll need
- Some coins, real or pretend
- A slate, small whiteboard or paper and pencil
What's in the book
Problems such as "If 4 pens cost 8 cents, how much will one pen cost? If one pen cost 2 cents, how much will 6 pens cost?" and "If 4 dozen eggs cost 20 cents, what will 6 dozen cost?", and making change.
The lesson, step by step
Two steps
For the eggs: first find one dozen (20 divided by 4 is 5 cents), then 6 dozen (6 times 5 is 30 cents).
Play shop
Set up a shop with prices like "3 apples for 9 cents". Your child works out the price of one, then of 5.
Book problems
Work through the page.
Afterwards
Unit 6 is done. Read real price labels at the shop together.
Answers to the book's problems
1. 2 cents; 12 cents. 2. 4 cents; 36 cents. 3. 30 cents. 4. 30 cents. 5. 40 cents. 6. 49 cents. 7. 9 cents. 8. 12 pears. 9. 4 lemons. 10. 8 cents. 11. 3 cents.
Worked out for this site from the scan. If a number in your copy differs, trust the book.