Addition and Subtraction Concepts 41
Rigorous Problem Solving with the Concept of
Number Line Profi ciency 1
Number line mix up!
Part A
Find and fi x the errors to complete the number line diagram.
Hint: 70 is correct. Count by ones.
65 65 67 66 69 70 80 81 73 75
Part B
Correctly place the following numbers to show skip counting
on the number line diagram.
100 140 70 150 80 130 90 110 60 120
Describe the skip counting.
© 2016, Math Intervention: Grades 3–5, Jennifer Taylor-Cox, Routledge