2. To win a contest, Hagrid’s dad must answer this skill-testing question: 9 + 3 x 6 - 4 = ______ With a partner, find as many ways as you can to answer this question.

3. Strategies 9 + 3 x 6 - 4 = ______

4. Obviously, we need an order: Evaluate the expression: add first, you get: 3 + 6 x 4 = 9 x 4 = 36 multiply first, you get: 3 + 6 x 4 = 3 + 24 = 7 ***Rule: multiplication (or division) is done before addition (or subtraction). So: 3 + 6 x 4 or 24 – 8 ÷ 2 = 3 + 24 = = 27 =

5. We can also use brackets if we want certain operations carried out before anything else: 2 x 4 x ( 4 + 6 ) What would we do first, second, third with this rule in mind? =

6. Now we have: Brackets Multiply & Divide Add & Subtraction We can use an acronym: BDMAS OR Brackets Multiply Divide Add Subtraction

7. BDMAS ***One more important rule: 1 – we’ve checked for anything inside brackets 2 – we’ve checked for multiplication or division and done those. But what if we have both x or ÷ or more than one of each? e.g. 12 x 4 ÷ 8 or 12 x 4 x 8 We calculate in order from left to right. It doesn’t matter whether x or ÷ comes first.

8. BDMAS The same goes for addition and subtraction: ***After you take care of BDM you do any Addition or Subtraction in order from left to right.

9. Solve: 18 – 10 + 6 =

10. Solving this expression using BDMAS looks like this: 16 - 14 ÷ 2 (divide 1 st ) = 16 – 7 (then subtract) = 9 **Reminder** I’ve lined up the = signs. You must do this for solving multistep (solving on more than one line) problems like this.

11. …and this? 8 x (7 – 2) + 1 =

12. To Review: Brackets Multiply OR Divide – in order from left to right Add OR Subtraction – in order from left to right Our acronym: BDMAS ***In grade 7 you will add an E for ‘exponents’ which will make our acronym BEDMAS but don’t worry about that yet

13. Practice Handout