Use known facts to 10 to derive other facts

ArithmeKit 24 from CanDoMaths ArithmeKit is an engaging resource that encourages pupils to use their knowledge of addition facts up to 10 to deduce other related facts. The activity starts by asking students to find matching pairs of sums by using a known addition fact as a starting point. For example, if they know that 17 plus 5 equals 22, then they can deduce that 45 plus 5 equals 50. This method of derivation is then applied to a series of addition problems, prompting students to fill in missing numbers based on their foundational understanding of sums to 10.

Further exploration of this concept is encouraged through the creation of students' own matching pairs problems. They are tasked with identifying patterns and relationships between numbers, such as the fact that adding one to a number in a known sum (e.g., 7 + 3 = 10) results in the sum increasing by one (e.g., 7 + 4 = 11). The activity also extends to multiplying by 10, showing that the same relationships hold for larger numbers (e.g., 70 + 30 = 100). In addition to these exercises, students are challenged to think critically about the nature of addition, such as whether the total remains the same when one number in a sum increases and the other decreases. This comprehensive approach not only reinforces arithmetic skills but also develops logical reasoning and problem-solving abilities.