Addition and Subtraction Concepts 93Rigorous Problem Solving with the Concept of
Partial Differences 2
Kolby is still preparing for the upcoming football season. To
increase his speed and agility he completes 73 ladder drills
every hour of practice. Of the ladder drills completed each
hour, 45 are lateral and the rest are forward. How many
ladder drills each hour are forward?
Part A
Which equation uses a place value strategy to represent the
total number of forward ladder drills Kolby completes each
hour?
o 73 – 45 = 30 + 5
o 73 – 45 = 30 + 1
o 73 – 45 = 30 – 1
o 73 – 45 = 50 + 2
o 73 – 45 = 30 – 2
Part B
What if Kolby completed 4 more lateral ladder drills per
hour?
Write an equation that uses a place value strategy to represent
the new number of forward ladder drills per hour.
© 2016, Math Intervention: Grades 3–5, Jennifer Taylor-Cox, Routledge