Ask a Teacher |
| Q: My child is having such a hard time learning to add decimals. What can I do to help? A: When a teacher introduces a new concept or skill, she is building on what the student already knows or has mastered. In order to teach a student addition with decimals, the student must first know how to add without regrouping and then with regrouping. (You might know regrouping as “carrying.") Now the student must know how to line numbers up when copying a math problem. Lining numbers up means the numbers in the ones place must be under the numbers in the ones place. The numbers in the tens place must be under the numbers in the tens place and so on. This skill is crucial to have mastered. With all those skills intact, the teaching of adding with decimals can be introduced. First, begin with adding similar decimals such as 5.83 + 9.05 = ?. Look at how many numbers are being added (two). Place that many decimal points on paper one under the other. Write what is on each side of the decimal points starting next to the decimal point and working out. Now add. Once that skill is mastered, then begin adding numbers such as: Put “0” in the places where there are no numbers. Thus the numbers will look like: Writing on paper without lines (using large numbers), or using graph paper (writing one number per square), are also ways to make it easier to line numbers up. Now you can see all the skills that have to be in place for this ONE skill…..adding decimals. |

Decimals: Skills within a skill |
| by Nancy Downing |
