Share the Headline Story with the class. Discussion of students’ results may lead to them noticing that the number times itself (for example 8 × 8) is always 1 greater than the product of its neighbors (8 × 8 is 64, but 7 × 9 is 63). There’s good fact practice here, and a useful pattern to remember.
Pick a number (like 9) and square it (multiply it by itself). Then pick its two nearest neighbors (like 8 and 10) and find their product. Compare the two answers. Do this with a few different numbers. What pattern can you find?