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
Adding Numbers
Adding Tens
120
Click on the appropriate choice. When done, click on the submit button.
What is the sum of the 2 numbers?
10
+
70
=
30
+
20
=
30
+
70
=
30
+
40
=
60
+
20
=
30
+
10
=
10
+
60
=
40
+
40
=
10
+
20
=
30
+
60
=
20
+
20
=
20
+
80
=
20
+
40
=
30
+
50
=
10
+
10
=
50
+
40
=
50
+
10
=
20
+
30
=
70
+
10
=
80
+
20
=
40
+
10
=
70
+
20
=
20
+
70
=
10
+
30
=
20
+
60
=
60
+
30
=
10
+
50
=
10
+
90
=
10
+
80
=
70
+
30
=
60
+
10
=
80
+
10
=
40
+
60
=
40
+
50
=
20
+
50
=
30
+
30
=
50
+
20
=
20
+
10
=
10
+
40
=
40
+
30
=
50
+
30
=
90
+
10
=
40
+
20
=
60
+
40
=
50
+
50
=