Skills
Give the correct order of operations.
Brackets, Exponents, Multiplication OR Division, Addition OR Subtraction (bedmas)
7(4) - 5
23
14 - 2 x 7
0
Name two operations that have the same priority
Multiplication and Division OR Subtraction and Addition
Why is it important to know BEDMAS?
So everyone can solve every problem the same (correct) way.
(8 + (−5)) × (−8) =
-5 x -8 = +40
8 + 40 = 48
Ignored Brackets. Answer should be -24
49 ÷ (3+4) + 5
In the operation: (4 x 2) +7, are the brackets necessary? Why or why not?
No because you would multiply first anyways
What do we do if there is more than step inside the brackets?
Continue to follow BEDMAS
4 + 5 + 7 - 3 x 2 = 26
You need to follow BEDMAS and do x first. Correct answer is 10.
(6 − (−8) + 10) × 3
72
the temperature change in a chemistry experiment was -2o C every 30 min. The initial temperature was 6o C
What was the temperature after 4 h?
- 10 degrees C
When can we ignore a set of brackets? Why?
When it only has one value inside. This is just to separate a negative from the operation signs and therefore there is no operation to perform.
3-(-5)+ 8(4)=3-(-5)+(-32)
=3-(-37)
= 40
added first - answer is 24
((10 − 6 + 5) ÷ 9) × 2
2
Keisha had $ 405 in her bank account. In one month, she made 4 withdrawals of $45 each.
What is the balance of her account?
405 + 4 x (-45) = $225
What do you do when subtracting a negative?
Keep Switch Switch
(−2) + (−4) − 8 × (2 ÷ ((−10) ÷ 10))
2 ÷ -1 = -2
-4 -8 = -12
-12 x -2 = -24
-2 + -24 = -26
Subtracted 8 from -4 before multiplying 8 by -2
Answer should be +10
5 × (4 ÷ (10 + 3 − 7 − 2))
5
Pythagoras was born about 582 BC. Isaac Newton was born in 1643 AD. How many years apart were they born?
1643 - (-582) = 2,225 Years