Rounding to nearest 10
89
90
295
300
2987
3000
398+230=
400+200=600
870-286=
900-300=600
45
50
219
200
5769
6000
498+174=
500+200=700
300-100=200
159
160
1839
1800
1923
2000
928+212=
900+200=1100
454-328=
500-300=200
238
240
6783
6800
2376
2000
345+167=
300+200=
867-474=
900-500=
1834
1830
4903
4900
9264
9000
335+758=
300+800=
378-378=
400-400=0