No. Marshall Cavendish does not offer a free, full-version PDF. Some schools provide access through a paid digital subscription. Beware of "free" sites—they are almost always pirated.
"My Pals Are Here! Maths" is published by Marshall Cavendish Education and is designed specifically for the Singapore primary mathematics curriculum. The series is renowned for its user-friendly approach, engaging characters, and its adherence to the approach. My Pals Are Here Maths 1b Workbook Pdf
Whether you have a physical copy or a legal PDF, here is a teaching strategy to maximize learning: My Pals Are Here Maths 1b Workbook Pdf