Lessons 3 · 1 lessons · O. A. Qo‘ysinov, O‘. O. Tohirov, D. N. Mamatov, D. F. Aripova. Labour education (Mehnat ta’limi), Grade 9: methodical guide for teachers. Delta-Print, Tashkent, 2017. Note: this is a teacher’s guide, not a student textbook (lesson plans for the “Technology and design”, “Service” and “Basics of agriculture” directions). The course is built from the lesson-plan topics of the “Technology and design” direction; the “Iroqi” skullcap lesson comes from the “Service” direction, and lesson 25 (joining parts) is written from the topic listed in the guide’s calendar plan.
Answers are for parents and teachers.
1
Look together with an adult at the mark on a piece of jewellery or tableware at home: what number is written? How do you understand it? Write.
Your own work
2
Compare gold, silver and platinum in a table by three properties.
Your own work
3
How many grams of pure gold are in 400 g of 750-fineness alloy?
300
4
Why do copper and silver items change colour with time? Write in 3–4 sentences.