Adding
18 + 66
84
86 - 74
12
Round 129 to the nearest 10
130
Round 192 to the nearest 100
134 + 65
199
98 - 19
79
Round 82 to the nearest 10
80
Round 830 to the nearest 100
800
725 + 189
914
84 - 19
65
Round 75 to the nearest 10
80
Round 158 to the nearest 100
200
602 + 98
700
370-128
242
Round 927 to the nearest 10
930
Round 724 to the nearest 100
700
513 + 77
590
121- 109
12
Round 248 to the nearest 10
250
Round 349 to the nearest 100
300