Ray's New Primary Arithmetic · Lesson LXXVI · Unit 7: Signs, bigger numbers and mixed problems
76. Trading: paying with something else
Goal: Your child works out how many of one thing pay for another (barter).
You'll need
- Coins and small items
- A slate, small whiteboard or paper and pencil
What's in the book
Problems such as "James bought 3 lemons, at 2 cents each, and paid for them with oranges, at 3 cents each: how many oranges did it take?"
The lesson, step by step
Two steps
First find the cost (3 lemons at 2 cents = 6 cents), then how many oranges make 6 cents (6 ÷ 3 = 2).
Trade game
Price some toys and let your child pay for one with others.
Work through the page
Do the problems.
Afterwards
Talk about trading before money: why was money invented?
Answers to the book's problems
1. 2 oranges. 2. 12 cents; 6 coins. 3. 4. 4. 6. 5. 2 quarts. 6. 6 barrels. 7. 5 quarts. 8. 8 barrels. 9. 4. 10. 5. 11. 5 pears.
Worked out for this site from the scan. If a number in your copy differs, trust the book.