Owl Egg
staying ahead wisely
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You have 20 minutes to finish this exercise
Name
Subject
Level
Section
Exercise
Lesson
Sample User
Math
1
Subtracting Numbers
Subtracting Tens
134
Click on the appropriate choice. When done, click on the submit button.
What is the difference between the 2 numbers?
40
-
30
=
80
-
20
=
90
-
60
=
20
-
0
=
30
-
20
=
60
-
50
=
70
-
40
=
90
-
10
=
100
-
100
=
100
-
90
=
60
-
40
=
100
-
30
=
90
-
70
=
60
-
30
=
10
-
0
=
80
-
10
=
30
-
10
=
60
-
10
=
40
-
0
=
100
-
60
=
70
-
70
=
60
-
0
=
70
-
20
=
90
-
0
=
50
-
20
=
100
-
50
=
60
-
20
=
90
-
50
=
80
-
0
=
90
-
90
=
100
-
80
=
100
-
40
=
70
-
60
=
90
-
30
=
100
-
10
=
80
-
30
=
40
-
20
=
80
-
80
=
60
-
60
=
80
-
70
=
10
-
10
=
50
-
50
=
50
-
30
=
40
-
10
=
90
-
20
=
80
-
40
=
100
-
0
=
70
-
50
=
70
-
0
=
50
-
40
=
20
-
10
=
30
-
0
=
50
-
10
=
80
-
50
=
70
-
10
=
100
-
20
=
50
-
0
=
30
-
30
=
90
-
40
=
80
-
60
=
70
-
30
=
20
-
20
=
90
-
80
=
100
-
70
=
40
-
40
=