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Each digit in a number has a name, and knowing them will help you add. Number places go from left to right: The spot on the left is the "ones" place. The second spot from the left is the "tens" place. The third spot from the left is the "hundreds" place. Here's an example: In the number 583, the 3 is in the ones place, the 8 is in the tens place, and the 5 is in the hundreds place. Line up your numbers so that each digit place is in a row. This makes it easier to add each column of numbers to get a final sum. If your problem is presented horizontally on a worksheet, it helps to rewrite it vertically to make it easier to solve. Each number place should be in its own line with each number stacked vertically. If one number uses fewer number spaces than another, leave the left spot blank. Here's an example: Here's how you'd write 16+4+342: 342 _16 +_4 The ones column is on the right. Once you have the sum of these numbers, write the ones digit of the sum in the ones place of your answer spot. If you have a tens digit in your sum, write it above the tens column in your problem. For 342+16+4, you'd add 2+6+4=12. Write the 2 in your ones place in your answer. Carry the other 1 into your tens column. If you have a number in the tens place, write the tens place number at the top of the tens column. This is the column located to the left of your ones column. You will include this number in the tens total. In the above example, you'd write the 1 from the tens place in 12 on top of the tens column. Go to the tens column, which is the next column to the left. Add up the numbers in this column, including your carry over number, if you had one. Write the ones place in this sum in the tens spot on your answer, then carry over the tens spot in your sum, if you had one. For 342+16+4, you'd add 4+1+1=6. Remember, the second 1 is the carry over from your ones sum. You'd write 6 down in the tens spot of your answer. You don't have any carry over from this sum. For longer problems, you'll need to add each column, moving from right to left. For each column, write the ones place of that column's sum in the corresponding number place in the answer. Then, carry over the tens place of the sum in the next column to the left. When you complete the last column on the right, you'll have your final sum. In our example, you only have one number in the hundreds column, so you'd carry down the 3 to your answer. Your final sum for 342+16+4=362. Although it seems challenging, you use the same process to add decimals as you do with whole numbers. Just make sure you line up each numbers place properly, including your decimals. If a number in the problem doesn't have a decimal, add a .0 to make it easier to workout the problem. Here's an example: 107.8 _24.5 __3.2 +15.0
Learn the number places. Write out your problem vertically. Line up the numbers. Add the ones column first. Carry the tens from the ones sum into the column of your problem. Count the next column. Continue working these steps until you get a final sum. Follow the same steps when adding decimals.