Adding 3-digit numbers in columns 2025

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3:18 9:10 Door. So heres an easy way to add this column you have a four and a one thats going to make five.MoreDoor. So heres an easy way to add this column you have a four and a one thats going to make five. And you all know that five plus five is ten so you know the answer is going to be ten.
The expanded form of a 3-digit number can be expressed and written in three different ways. Consider a three-digit number 457. The number 457 can be written in one form as 457 = (4 hundreds) + (5 tens) + (7 ones). In the second way, the number 457 can be written as 457 = (4 100) + (5 10) + (7 1).
1:33 6:48 So 432 has 400s and 527 has 500s. So this is part one of our trick. Remember that all of this isMoreSo 432 has 400s and 527 has 500s. So this is part one of our trick. Remember that all of this is happening in our brain. Okay now 432 has 3 tens which is 30. And 527 has 2 tens that is 20..
1:20 11:51 So first youll get the answer for three times 125. And youll write that answer directly underneathMoreSo first youll get the answer for three times 125. And youll write that answer directly underneath the first line. So next youre going to get the answer for 50 times 125.
Column addition has three steps: Create columns for each place value to be added. Add the digits in each vertical column. Check that each column in the sum has only 1 digit. If a column has more than 1 digit, regroup to the next column to the left. To regroup means to rewrite a number using new groups.
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One way to test if a three-digit number is divisible by 11 is to follow the 3-digit rule: the sum of the first and last digits equals the middle digit. To determine if the number 792 is divisible by 11, we find the sum of seven and two.
Three-digit numbers are the numbers 100 to 999, which have digits in the hundreds, tens and ones places. Examples include: 113.

adding 3 digit numbers in columns with regrouping