People's Education Edition Elementary School Two Years of Volume Two, Unit Five, The First Class Hour, "Understanding Thousands of Thousands" PPT1, Answer: What is the largest single digit? What is the smallest two-digit number? What is the difference between these two numbers? The largest one-digit number is 9, and the smallest two-digit number is 10. The difference between them is 1.2. Q: What is 99 plus 1? 99 + 1 = 1003. Will you count from 100 and then back?

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