Read out 2, 4, 8, 3, 10 to a six-year-old, and the 3 often slips past unnoticed, because every number sounds equally ordinary. Spotting it takes a rule. This 1st grade find the odd number worksheet works in two parts. At the top, eight rows mix even numbers with exactly one odd number, and your child writes that odd number in the circle at the end. Below, six rows count up in odd numbers, such as 71, 73, 75, 77, 79, and your child writes what comes next. The numbers reach past 100, while the rule stays the same. A second page gives the answer key.