Adding 10 means increasing a whole number by one group of ten: the ones digit stays the same, while the tens digit increases by one, with regrouping into the next hundred when necessary (for example, 290 + 10 = 300). This connects addition to place value and mental computation, and does not include adding arbitrary multiples of ten, decimals, negative numbers, or generalized algebraic rules.
To add , increase the tens digit by 1. The ones digit stays the same.
Example:
Therefore,
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