2. Properties are special qualities of something. Addition and multiplication have special qualities that help you solve problems mentally = MENTAL MATH!!

3. Commutative Properties ANY ORDER! You can add or multiply in any order and get the same answer. 5 + 3 = 84 x 9 = 36 Or 3 + 5 = 8 9 x 4= 36

4. Does it work for subtraction? Does it work for division?

5. Associative Properties GROUP NUMBERS! You can group numbers in different ways when adding or multiplying and get the same answer. 4 + (6 + 7) = 172 x (5 x 13) = 130 or (4 + 6) + 7 = 17(2 x 5) x13 = 130

6. Does it work for subtraction? Does it work for division?

7. Distributive Properties BREAK APART NUMBERS! You can multiply a sum by a factor by finding two separate products and adding the products. 4 x 12 = 48 4 x (10 + 2) = 48 (4 x 10) + (4 x 2) = 48

8. Does it work for subtraction? Does it work for division?

9. Let’s Practice! Solve using mental math. Name the property you used! 200 x 36 x 5 = 25 + 634 + 75 = 3 x 29 =

10. Use compensation to find answers mentally! 58 + 93 = (58 + 3) + (93 – 3) = 61 + 90 = 151 352 – 49 =