ORDER OF OPERATIONS

2. What is the answer to this?
40 ÷ 4 + 6 = ?

3. What should we do to
find the answer to the
problem?

4. What operation should
we do first? Division or
Addition?

5. What is the answer to
this?
40 ÷ 4 + 6 = ?
My
answer
is 4.
My
answer
is 16.
Ritz Laine

6. Looking at their answers, it
seems that both of their answers
are correct.
But…..

7. If we follow the rule for
ORDER OF OPERATIONS, we
will find out the correct
answer.

8. Long ago,
mathematicians agreed
on a rule to find the
answer to such a problem.

9. When a problem has more
than one operation, they
are to do the operations in
a certain order.

10. What is the answer to
this?
40 ÷ 4 + 6 = ?
My
answer
is 4.
My
answer
is 16.
Ritz Laine
Who do you think get
the correct answer?

11. In this expression, we
will follow:

12. Add +
Subtract -
Multiply x
Divide 
M
D
A
S

13. In this problem, we will
do division first.
40 ÷ 4 + 6 = ?

14. 40 ÷ 4 + 6 = ?
10

15. Then, next is addition.
40 ÷ 4 + 6 = ?
10 + 6 = 16

16. What is the answer to
this?
40 ÷ 4 + 6 = ?
My
answer
is 4.
My
answer
is 16.
Ritz Laine

17. REMEMBER:

18. When addition and
subtraction come in a
row, you do the
operation as they
occur.

19. EXAMPLE 1
54 + 67 – 10 = ?
121 – 10 = 111
EXAMPLE 2
234 – 67 + 87 = ?
167 + 87 = 254

20. When multiplication
and division come in a
row, you do the
operation as they
occur.

21. EXAMPLE 1
45 ÷ 9 X 5 = ?
5 X 5 = 25
EXAMPLE 2
20 X 5 ÷ 2 = ?
100 ÷ 2 = 50

22. When all four operation
are together in an
expression, follow MDAS
(Multiplication, Division,
Addition, Subtraction)

23. EXAMPLE 1
30 + 16 - 7 X 4 ÷ 2 = ?
30 + 16 – 28 ÷ 2 = ?
30 + 16 – 14 = ?
46 – 14 = 32
EXAMPLE 1
8 x 14 – 60 ÷ 5 + 34 = ?
112 – 60 ÷ 5 + 34 = ?
112 – 12 + 34 = ?
100 + 34 = 134

24. Thank You!!!