skill practice 1 number practice answ
addition, aligning digits by place value: ``` 356 + 789 ``` Step-by-step calculation: Units: 6 + 9 = 15 → write 5, carry over 1 Tens: 5 + 8 + 1 (carry) = 14 → write 4, carry over 1 Hundreds: 3 + 7 + 1 (carry) = 11 → write 11 Answer: 1145 Number Patterns and Sequences