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    1. Which number in each of the following pairs is a multiple of 3?
      2. 11    21
      12    22
      23    33
      14    24
      15    25
      16    36
      17    27
      18    28
      39    19

    2. Can you tell whether a number is a multiple of 3 by looking at its last digit? If so, tell what digits multiples of 3 end in.
  2. Write the following multiplication problems using exponents. Then multiply.
    3. Example: For 3 3, write 32 = 9.
    1. 2 2
    2. 5 5
    3. 7 7
    4. 10 10
  3. Rewrite the following without using exponents. Then multiply.
    4. Example: For 42, write 4 4 = 16.
    1. 82
    2. 32
    3. 92