10 Most Common 3rd Grade STAAR Math Questions 10 Sample 3rd Grade STAAR Math Practice Questions 1- Classroom A contains 8 rows of chairs with 4 chairs per row. If classroom B has three times as many chairs, which number sentence can be used to find the number of chairs in classroom B? A. \ (8 × 4 + 3\) B. \ (8 + 4 × 3\) C. \ (8 × 4 × 3\) D. \ (8 + 4 + 3\)