Arithmetic Grade Four

Lesson Twenty-nine: Rounding to nearest 100

Rounding to the Nearest 100

Consider the following examples:

     1222 -> 1200              1388 -> 1400              1111 -> 1100
      899 ->  900               566 ->  600            23,555 -> 23,600
     1988 -> 2000              2391 -> 2400             2349  -> 2300
     3450 -> 3500              9999 -> 10000            2150  -> 2200

1. If the number in the tens column is 4 or less, then round down. (Example: 544 -> 500.)
2. If the number in the tens column is 5 or more, then round up. (Example: 550 -> 600.)

If you get a number like 2950, it rounds up to 3000. Many students are confused by these kinds of problems.

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