Rounding to the nearest 10
46
198
200
12 + 22 =
10 + 20 = 30
61 - 47 =
60 - 50 = 10
61,000
60,000
8
10
244
200
24 + 36
20 + 40 = 60
89 - 42
90 - 40 = 50
122,000
120,000
134
135
378
400
33 + 48
30 + 50 = 80
63 - 8 =
60 - 10 = 50
478,000
480,000
429
430
529
500
45 + 51 =
50 + 50 + 100
97 - 18
734,000
730,000
612
610
670
64 = 72 =
60 + 70 = 130
102 - 49 =
100 - 50 = 50
907,000
910,000