Addition is putting numbers together to find the total or the sum. When we add a two-digit number and a one-digit number, we are finding out “how many in all.”
Addition always combines numbers to make a bigger total (unless zero is added).
The break-apart strategy helps make addition easier by splitting the one-digit number into parts we can add step by step.
Break apart the one-digit number so that the first part helps you reach the next multiple of ten. This makes adding easier and faster.
Let’s see more examples of adding a two-digit number and a one-digit number using the break-apart strategy:
Look for the nearest multiple of ten to make the addition smoother. Always check your final answer by adding the numbers back together in the original form.
This method works because numbers can be broken into parts, and addition can be done in steps. The total will stay the same no matter how the numbers are grouped.
Addition is flexible. You can add numbers in different parts, but the sum will always be the same.