Show a seven-year-old the row 47, 46, 44, 41 and they will often say 40 next, because numbers usually go down by one. This 2nd grade number sequence rule worksheet asks them to look closer. The top half holds three rows of five numbers with an empty box at the end. Each row hides a step that changes as it goes. The bottom half has four riddles. One asks for a three-digit number with a 4 in the tens place and a 1 in the ones place. Another hides a number whose four equal digits add up to 16. A second page gives the answer key.