Ray's New Primary Arithmetic · Lesson LXXXVI · Unit 8: Money, weights and measures
86. Square measure: area
Goal: Your child finds the area of a rectangle by multiplying length and width.
You'll need
- Square tiles or paper squares
- A tape measure
- A slate, small whiteboard or paper and pencil
What's in the book
The table of square measure (square inches, feet, yards, rods, acres, square miles), then problems such as "How many sq. ft. in a blackboard 9 feet long and 3 feet wide?"
The lesson, step by step
Cover it with squares
Lay paper squares over a book cover: 4 rows of 6 squares make 24 squares. That is the area.
Multiply instead
Show that length × width gives the same number without counting.
Book problems
Do the problems you find easy; the acre and square-mile ones can wait.
Afterwards
Find the area of a rug or a room in square feet.
Answers to the book's problems
5. 27 sq. ft. 6. 20 sq. yd. 7. 9 sq. yd. 8. 20 yards. 9. 42 cents. 10. 5 sq. ft. 11. 36 sq. ft. 12. 32 sq. ft. 13. 2 sq. mi.
Worked out for this site from the scan. If a number in your copy differs, trust the book.