I learned this from a copy, so there are no answers filled in (probably). Shipping will be in a reused plastic bag + envelope, and will not be wrapped in bubble wrap. Please purchase only if you understand. A problem book that gently explains 5th-grade arithmetic. - Title: Understanding 5th Grade Arithmetic Step by Step. - Publisher: Gakken - Contents: Private lessons + problem book - Features: Explanations in easy-to-understand language Thank you for viewing.