1. Round to the nearest 100

2. When rounding to the nearest hundred:
If the tens digit is 1, 2, 3 or 4, go BACK to the previous multiple of a hundred.
If the tens digit is 5, 6, 7, 8 or 9, go ON to the next multiple of a hundred.

3. Round 235 to the nearest 100
200
210
220
230
240
250
260
270
280
290
300

4. Round 235 to the nearest 10
230
231
232
233
234
235
236
237
238
239
240

5. Round 281 to the nearest 100
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230
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250
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270
280
290
300

6. Round 281 to the nearest 10
280
281
282
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284
285
286
287
288
289
290

7. Round 412 to the nearest 100
400
410
420
430
440
450
460
470
480
490
500

8. Round 412 to the nearest 10
410
411
412
413
414
415
416
417
418
419
420

9. Round 668 to the nearest 100
600
610
620
630
640
650
660
670
680
690
700

10. Round 668 to the nearest 10
660
661
662
663
664
665
666
667
668
669
670

11. Round 550 to the nearest 100
500
510
520
530
540
550
560
570
580
590
600

12. Round 250 to the nearest 100
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210
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230
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250
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280
290
300