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To solve this problem, we'll follow these steps:
Step 1: Align the numbers by place value:
Step 2: Add the units digits: . Write down in the units place and regroup by carrying over to the tens place.
Step 3: Add the tens digits, including the carry: .
By following these steps, the sum of and is .
Therefore, the solution to the problem is .
90
\( \begin{aligned} &90 \\ +& \\ &~~9\\ &\underline{\phantom{776}} & \\ \end{aligned} \)
When adding digits gives you 10 or more, you write down the units digit and carry the tens digit to the next column. For example: means write 0 and carry 1.
Alignment ensures you're adding like place values together - units with units, tens with tens. Misalignment leads to wrong answers because you'd be mixing different place values.
That's perfectly normal! If the sum of digits is 9 or less, just write that digit down and move to the next column. Carrying only happens when sums reach 10 or higher.
It's much harder! Adding from right to left (units first) is the standard method because any carrying affects the column to the left, making the process cleaner and more reliable.
Try these methods:
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