Estimating sums to 1000

Use rounding to estimate the answer to the addition problem.
341 + 441
607 + 278
367 + 142
566 + 219
487 + 469
312 + 559
289 + 433
299 + 439
479 + 283
582 + 413
383 + 578
171 + 468
139 + 642
79 + 718
262 + 581
397 + 328
168 + 689
133 + 308
129 + 284