This facts of 15 worksheet has a set of problems curated to ensure that your child becomes more proficient in multiplication. After mastering multiplication facts up to 10, students should multiply one-digit numbers by two-digit numbers in facts of 15 worksheet using their knowledge of tens and ones. This worksheet is about practicing with the horizontal format in which numbers are written side by side. To develop flexibility with numbers and operations, students need to have enough practice in this format and not just rely on the vertical/column method.