Highlighted prime numbers in a 1-100 number grid.
A 10x10 grid of numbers from 1 to 100 with certain numbers highlighted in yellow, including 1, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97 — all prime numbers.