☰ Contents · Algebra

Sum of the terms of an arithmetic progression

Lessons 31 · 1 lessons · Sh.A. Alimov, A.R. Xalmukhamedov, M.A. Mirzaakhmedov. Algebra: textbook for Grade 9 of general secondary schools. Revised 4th edition. Tashkent: “O‘qituvchi”, 2019
Answers are for parents and teachers.
1
Find the sum of the natural numbers from 1 to 200.
2
Find the sum 2 + 4 + 6 + ... + 100.
3
If a₁ = 10 and d = −2, find S₈.
4
How many consecutive natural numbers starting from 1 add up to 120?
5
Find 5 + 8 + 11 + ... + 32 (first find the number of terms).