Arithmetic Series
10 tutor-authored questions for this Ontario curriculum expectation, ordered easiest to hardest — every one with a full worked solution. Work through them free, no account needed.
Sample: the first question, solved
State the formula for the sum of the first n terms of an arithmetic series.
📘 Worked solution
✓Sₙ=n/2×(2a+(n−1)d), or Sₙ=n/2×(a+tₙ).
And one from the hard end
Find the sum of 3+8+13+...+63.
Solution shown after you try it in practice mode.
Work through all 10, easiest to hardest
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