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Add and subtract multi-digit whole numbers using the standard algorithm.
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When digits in a column add up to 10 or more, regroup (carry) to the next column.
Example:
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When you can't subtract a digit, borrow from the next column.
Example:
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Always estimate to check if your answer is reasonable:
Key words for addition: total, sum, altogether, combined, in all Key words for subtraction: difference, how many more, how much less, remaining
Tip: Always line up numbers by place value when adding or subtracting!