1. On a copy of the 100 Chart in your Student Activity Book, use a blue crayon or pencil to circle all the multiples of 2. Then, describe any patterns you see. Save your copy of the 100 Chart to use later in the lesson.
  2. Shannon's book is 318 pages long. In which column would 318 be if the 100 Chart kept going beyond 100?
    1. Which of the following numbers are divisible by 2? Why do you think so? Check your predictions using a calculator.
    2. 109 213 216 275 784
      1000 1358 2462 6767 8091
    3. Write a multiplication sentence and a division sentence for each number that is divisible by 2. For example, 216 ÷ 2 = 108 and 108 2 = 216. Use a calculator to help you.
  3. How can you tell if a number is divisible by 2?

Is It Divisible by 3?

12 is divisible by 3.
4 3 = 12
12 ÷ 3 = 4
21 is divisible by 3.
7 3 = 21
21 ÷ 3 = 7
30 is divisible by 3.
10 3 = 30
30 ÷ 3 = 10

3 is a factor of 12, 21, and 30. A factor of a number can be divided evenly or exactly into the number. That is, when you divide a whole number by one of its factors, the answer (or quotient) is a whole number. Since 12, 21, and 30 can be divided by 3 evenly, we say that 12, 21, and 30 are divisible by 3.
  1. Use your copy of the 100 Chart that you used earlier. The multiples of 2 should be circled in blue. Using a red crayon or pencil, mark all the multiples of 3 with an “X.” Your 100 Chart should look like the one below.

  2. Describe any patterns you see.