Subtract multiples of 10 from a 2-digit number

The ArithmeKit 211 from Buzzard Publishing's CanDoMaths series presents an engaging way for children to practice subtracting multiples of 10 from two-digit numbers. The exercises require learners to fill in missing digits, fostering their understanding of subtraction and number relationships. For instance, when presented with problems like 86 minus a mystery number equals 76, students must determine that the missing number is 10. This activity highlights a pattern; when subtracting multiples of 10 from a two-digit number, the ones digit remains unchanged, a concept reinforced through various examples and independent calculations.

Children are encouraged to explore this concept further by creating their own subtraction problems and using a range of digits to find multiple solutions. In doing so, they deepen their comprehension of basic subtraction principles. For example, calculating 43 minus 30 to get 13, or 83 minus 30 to result in 53, demonstrates the consistent pattern that the tens digit decreases by the multiple of 10 subtracted, while the ones digit stays the same. Through these exercises, students also learn to efficiently count back in tens, which is a useful mental arithmetic strategy. The kit's interactive approach not only builds mathematical fluency but also allows for the discovery of patterns and the development of problem-solving skills.