Add the following numbers: 1 + 2 + 3 + 4 + … + 100 You have 30 seconds. Go!
Watch my lessons on Arithmetic Series and Sequences and learn to add lists of numbers like this quickly and easily. You’ll also learn to do problems like this: What is the 345th term of the sequence 5, 8, 11, 14,…? You’ll amaze your friends (and yourself) with how clever you are!