Use known facts to 10 to derive other facts

ArithmeKit 210 presents a mathematical exercise that encourages students to use known subtraction facts up to 10 to deduce other related facts. The activity involves finding the matching pairs by applying these known facts. For instance, students are challenged to fill in missing numbers based on the principle that if subtracting 6 from 10 equals 4, then subtracting 6 from 11 would result in 5. This pattern is repeated with various numbers, reinforcing the concept of building upon known facts to derive new ones. Additionally, the exercise includes creating problems where one has to find the missing digits to complete subtraction equations, encouraging students to think critically and apply their understanding of basic subtraction facts.

The kit also poses a question from a character named Coco, who suggests that subtracting one more from a number results in an answer that is one more, prompting students to use practical resources to explore the validity of this statement. Through these activities, students are guided to notice patterns and relationships between numbers, which helps to deepen their understanding of subtraction. Completing the exercises with different numbers further enhances their ability to use known facts to derive other facts, an essential skill in developing mathematical fluency and reasoning.