分析:我们分别用1到9的数值在百位上,个位上是6,组数只要符合被3整除即可,由此可知有:126,156,186,216,246,276,336,366,396,426,456,486,516,546,576,606,636,666,696,726,756,786,846,876,906,936,966,996,共计28个.
解答:解:126,156,186,
216,246,276,
336,366,396,
426,456,486,
516,546,576,
606,636,666,696,
726,756,786,
846,876,
906,936,966,996,
共计28个.
故答案为:28.
点评:本题考查了能被3整除的数的特征.