Error Analysis – Order of Operations
Billy Bob missed class yesterday so he went onto the class website to pull up the Order of
Operations worksheet. He took risks and worked persistently but made mistakes along the way.
In the boxes below, please:
a) Circle the mistakes in his original work.
b) Then show the correct work below and solve the problem.
25 – 9 x 2 + 3
2 + 3(5 + 4)
15 – 12  4 x 3
= 25 – 18 + 3
= 2 + 3(9)
= 15 – 12  12
= 25 – 21
= 5(9)
= 15 – 1
=4
= 45
= 14
Corrections:
Corrections:
Corrections:
6+93x4
5 x 6 – 33  3
4(8 – 2)
2+1
= 15  3 x 4
=5x6-93
=5x4
= 30 – 3
= 4(6)
2+1
= 20
= 27
= 24  2 + 1
Corrections:
Corrections:
= 12 + 1
= 13
Corrections: