For addition problems, what approach can best support students learning two-digit subtraction?

Connecting addition to subtraction through examples is a highly effective approach for helping students learn two-digit subtraction. This method relies on the intrinsic relationship between addition and subtraction, as they are inverse operations. When students understand how addition can be used to check their subtraction work or how to decompose numbers in subtraction by adding back to the minuend, they are more likely to grasp the concepts involved thoroughly.

For instance, if students are working on a subtraction problem like 42 - 25, they can think of it in terms of addition: recognizing that if they can find the missing addend that, when added to 25, results in 42, they can reinforce their understanding of both operations. This use of examples encourages a deeper understanding of number relationships and helps to solidify their skills in subtraction within the framework of addition.

Moreover, this approach provides an opportunity to discuss various strategies and visual aids, such as number lines or models, which can further assist students in visualizing the problems and finding solutions. Building these connections actively engages students and fosters a more comprehensive understanding of mathematical principles, making them more confident and capable in solving subtraction problems.