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WORKED EXAMPLE: For 368 + 257, add ones: 8 + 7 = 15, write 5 and regroup 1 ten. Add tens: 6 + 5 + 1 = 12, write 2 and regroup 1 hundred. Add hundreds: 3 + 2 + 1 = 6. NOW TRY: 486 + 379.