Work out skip counting instantly with clear inputs, formula shown and shareable results.
Skip counting is an arithmetic progression: the nth term is start plus (n - 1) times the step, and the total is n times the average of first and last. Skip counting in threes, fours and fives is the scaffold for multiplication tables, and writing the sequence out makes the repeating units digit pattern obvious.
nth term
term(n) = start + (n - 1) x step
Sum of terms
sum = n x (first + last) / 2
term(n) = start + (n - 1) x step. Skip counting is an arithmetic progression: the nth term is start plus (n - 1) times the step, and the total is n times the average of first and last.
Skip counting in threes, fours and fives is the scaffold for multiplication tables, and writing the sequence out makes the repeating units digit pattern obvious.
Enter start at, count in steps of, how many numbers. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.