The problems involve arithmetic, algebra and geometry, including mensuration. During his presidency, he continued to teach algebra, mensuration, and arithmetic. Most of the movements feature pairs of mensuration canons. Larry Polansky has an album of mensuration canons, "Four-Voice Canons". There are several recordings of his work, including an album of mensuration canons, "Four-Voice Canons". The four voices each sing in a different mensuration. This is done in her odd number year like 7,9 or 11 before mensuration. Colonialisation required navigation, mensuration, languages and administrative skills. He also made use of irregular mensuration signs, found in few other manuscripts. Peet referred to these problems as "mensuration problems". These are often referred to as "trawl monitoring systems" or "net mensuration systems".