Rounding
397 rounded to the nearest 100
400
700+199 is about...
900
444+555=
999
401+307=700
Yes, it is reasonable
200+80+1
281
8,972 rounded to the nearest 10
8,970
752+122 is about...(rounded to the nearest 100)
900
345+335=
680
650+230=1,000
(hint: round to nearest 100)
No, it is not reasonable
Explanation: 700+200=900
1,000+3+500+90
1,593
8,972 rounded to the nearest 1,000
9,000
385+549 is about... (rounded to the nearest 10)
940
268+369=
637
298+467=770
(hint: round to the nearest 10)
Yes, it is reasonable
Explanation: 300+470=770
1 ones + 7 tens + 3 hundreds
371
9,750 rounded to the nearest 100
9,800
1,234+4,123 is about... (rounded to the nearest 100)
5,300
854+268=
1,122
987+524=1,500
(hint: round to nearest 100)
No, it is not reasonable
Explanation: 1,000+500=1,400
5 tens
40 hundreds
5 ones
4,055
75,843,169,528 rounded to the nearest 100
75,843,169,500
856,459 + 32,789 is about... (rounded to the nearest 1,000)
889,000
33,085+34,585
67,670
12,897+ 73,546= 87,023
(hint: round to the nearest 1,000)
yes, it is reasonable
Explanation: 13,000+74,000=87,000
36 ones
10 tens
4 hundreds
536