Learn the ins-and-outs of skip counting and stop guessing! Make sense of the 100 chart and take advantage! Discover new number patterns and pick up the pace! 99 100s is all about "counting with more number sense.""Counting with number sense" is, among other skills, a matter of confidently and accurately following multiple step sequences; building a quick, sharp memory; and paying close, thoughtful attention to place values.99 100s activities direct...