When the ones column sum is โฅ 10, we "carry" to the tens column. Example: 247 + 165. Ones: 7+5=12 โ write 2, carry 1. Tens: 4+6+1(carry)=11 โ write 1, carry 1. Hundreds: 2+1+1(carry)=4. Answer: 412. Carrying is also called "regrouping" โ we regroup 10 ones into 1 ten.
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