Math Background

Place Value to 100: When Students Ask

  • Why is place value important?
    Place value is important because it helps you understand the meaning of a number. If people just used numbers randomly, no one would know which numbers people meant. You need place value to understand the order of numbers as well. If someone offered you 30 dollars or 99 dollars, you would need to know that 99 is more than 30 if you wanted the greater amount of money.
  • What patterns can I find on a hundred chart?
    There are many patterns to be found on a hundred chart. You can see how the numbers repeat for each tens group and how adding 10 to any number just changes the digit in the tens place. You can also see the pattern of counting by 5s, or 2s or 10s, and so on.
  • How can I compare two-digit numbers?
    You can compare two-digit numbers by first looking at the tens digit. Compare the tens digit for each, and see which is the larger or smaller of the two. The larger of the two would then be the larger, or greater, number. If the tens digits are the same, then you must look at the ones digits. The larger of the ones is the larger, or greater, number.

Houghton Mifflin Math Grade 2