1. Math Journal Notes
Unit 5

2. 1/10/17

3. A number is divisible by....
2 if it is an even number
3 if the sum of the digits is divisible by 3
5 if it ends in a 0 or 5
6 if it is also divisible by BOTH 2 and 3
7 take the last digit, double it, and subtract it from the rest of the number. If that number is divisible by 7, you can divide by 7.
8: If the last three digits of a whole number are divisible by 8, then the entire number is divisible by 8
9 if the sum of the digits is divisible by 9
10 if it ends in a 0
1/18/17
Divisibility Rules
Divisible / Divisibility:
Can be divided by

4. 12/1/16

5. 2/2/17

6. 3/6/17
START UNIT 5 NOTES IN YOUR
NEW MATH JOURNAL!

7. 3/7/17

8. Fraction < 1 Fraction > 1 Fraction = 1
How To Estimate the Product (Answers) When Multiplying Fractions
3/30/17
Fraction < 1
Fraction > 1
Fraction = 1
When you multiply a number by a fraction that is less than 1, then the product will be smaller than that number.
Example-
11 x 3/5 < 11,
33/5 < 11,
6 3/5 < 11
6 3/5 is less than 11
When you multiply a number by a fraction that is greater than 1, then the product will be larger than that number.
Example-
4 4/9 x 7/3 > 4 4/9,
40/9 x 7/3 > 4 4/9,
280/27 > /9
10 18/27 is greater than 4 4/9
When you multiply a number by a fraction that is equal to 1, then the number will stay the same.
Example-
2 6/7 x 10/10 = 2 6/7,
2 6/7 x 1 = 2 6/7,
2 6/7 = 2 6/7
2 6/7 is equal to 2 6/7

9. You Try It:

10. You Try It: