☰ Contents · Mathematics

GCD, LCM and coprime numbers

Lessons 7–8 · 2 lessons · M.A. Mirzaahmedov, A.A. Rahimqoriyev, Sh.N. Ismailov, M.A. To‘xtaxodjayeva. Mathematics Grade 6, 2nd edition. O‘qituvchi NMIU, Tashkent, 2017
Answers are for parents and teachers.
1
Find LCM(12, 15).
2
Find GCD(54, 72).
3
A hall is 48 dm long and 36 dm wide. If the floor is covered with the largest square tiles, what is a tile's side in dm?
4
Two buses leave every 20 and 30 minutes. After leaving together, in how many minutes do they leave together again?
5
Show that 15 and 28 are coprime.