The worksheet titled "Multi-Digit Subtraction up to Six Digits: Plus Running Addition and Subtraction Problems" gives students practice subtracting large numbers up to six digits. The two numbers in each problem sometimes have the same number of digits, but sometimes they don't. For example, students complete the problem 556 - 298 and the problem 153,332 - 81,655.

There are also running addition and subtraction problems on the right-hand side of each worksheet. For example, students might start by adding 6 + 9, then add their answer to 5, and so on and so forth until they find the answer. Sometimes, the answer is given in the string of problems. It helps students double-check their work as they go, but it also gives them opportunities to find the addends or numbers being subtracted, which encourages early algebraic thinking.

The best way for students to get better at subtraction is to do lots of subtraction problems. That's especially the case when it comes to subtracting large numbers, as it gives students practice borrowing and writing clearly so they can keep track of the borrowed numbers.

Running addition and subtraction problems can also be a good way to help students build stamina when solving problems. Instead of adding or subtracting two numbers to get the answer, they must add and subtract a string of numbers, which mimics the patience needed to solve subtraction problems with multiple digits.