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- 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.
- Shannon's book is 318 pages long. In which column would 318 be if the 100 Chart kept going beyond 100?
- Which of the following numbers are divisible by 2? Why do you think so? Check your predictions using a calculator.
- 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.
- How can you tell if a number is divisible by 2?
| 109 | 213 | 216 | 275 | 784 |
| 1000 | 1358 | 2462 | 6767 | 8091 |
Is It Divisible by 3?
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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.
- 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.
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- Describe any patterns you see.
