Ray's New Primary Arithmetic · Lesson LXX · Unit 7: Signs, bigger numbers and mixed problems
70. Spending, change and ages
Goal: Your child solves stories about spending money and getting change, and about ages.
You'll need
- Coins, real or pretend
- A slate, small whiteboard or paper and pencil
What's in the book
Problems such as "Henry had 25 cents: he spent 4 cents for a top, and 6 cents for a kite: how many cents has he left?" and "Charles is 4 years old, and his father is 32 years old: in how many years will Charles be as old as his father is now?"
The lesson, step by step
Play shop with change
Your child has 25 cents and buys two things. How much is left? Count the change back.
Ages
Talk through Charles and his father: from 4 to 32 is 28 years.
Work through the page
Do the rest of the problems.
Afterwards
Let your child handle the change on a real small purchase.
Answers to the book's problems
1. 14 cents. 2. 15 cents. 3. 10 cents. 4. Gave away 10, had 12 left. 5. 30 cents. 6. 5 cents. 7. 12 cents. 8. 28 years. 9. 65 cents more. 10. 4 cents. 11. Paid 40 cents, had 10 cents left.
Worked out for this site from the scan. If a number in your copy differs, trust the book.