Let's review what you've learned about multiplication problems that have two-digit numbers where you may regroup (carry) once. You know that when m­ultiplying by a two-digit number that does not end in zero, there are simple steps to remember. Cover the tens digit, work the problem, and write the answer. Cover the ones digit, write a zero in the ones place (ones column), work the problem, and write the answer. Then add both answers to get the product, or answer, to the whole multiplication problem.

Take a look at this example:

Remember the steps: cover the tens digit, work the problem, and write the answer.

Then cover the ones digit. In the problem below, we're multiplying by a tens number, so we'll write 0 in the ones place when we multiply. Then we work the problem.

Lastly, add both answers to get the product to the whole multiplication problem.