Add column by column: Ones first, then Tens, then Hundreds. Example: 234 + 152. Ones: 4+2=6. Tens: 3+5=8. Hundreds: 2+1=3. Answer: 386. Always write answer below the line. This is called the column addition method. Practice: 421+235=? 312+261=? Always check by adding in reverse order!
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