Multiple choice general knowledge math & puzzles 81,64,49,36,.. 28 18 24 25 Reveal answer Fill a bubble to check yourself D Correct answer Explanation The sequence consists of the squares of descending integers: 9^2 (81), 8^2 (64), 7^2 (49), and 6^2 (36). The next number in the sequence is 5^2, which is 25.