Ray's New Primary Arithmetic · Lesson LXXXI · Unit 8: Money, weights and measures
81. Troy weight (gold and silver) optional
Goal: Optional. Your child meets the weights still used for gold and silver.
You'll need
- A slate, small whiteboard or paper and pencil
What's in the book
The table: 24 grains make 1 pennyweight; 20 pennyweights make 1 ounce; 12 ounces make 1 pound. Then problems about gold and silver.
The lesson, step by step
Still used
Gold and silver are still priced by the troy ounce today.
The table
Read the table. Do a few of the easy problems: ounces in 5 pounds; pounds in 96 ounces.
Afterwards
Optional.