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Sagot :
Here are the key steps to add 3 to 4-digit numbers with up to 3 addends:
1. Write the numbers vertically, aligning the digits by place value (ones, tens, hundreds, thousands).
2. Start adding from the ones column. Add the digits in the ones column of each addend. If the sum is less than 10, write it in the ones column of the answer. If the sum is 10 or greater, write the ones digit in the answer and "carry" the tens digit to the tens column.
3. Move to the tens column. Add the digits in the tens column of each addend, plus any carry over from the ones column. Write the ones digit of the sum in the tens column. If there is a tens digit, carry it to the hundreds column.
4. Repeat step 3 for the hundreds and thousands columns, carrying tens digits to the next higher place value as needed.
5. The final answer will be the sum of all the columns.
Some examples:
- Adding 427 and 315 gives 742 (4+3 = 7, 2+1 = 3, 7+1 = 8)
- Adding 1047, 2634, and 3921 gives 7602 (7+4+1 = 12, 4+3+2 = 9, 0+6+9 = 15, 1+3+9 = 13)
The key is to add the digits in each column, carrying tens digits to the next higher place value, until all columns are added. With practice, 3 and 4-digit addition becomes quick and easy.
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