86 Addition and Subtraction Concepts
Rigorous Problem Solving with the Concept of
Partial Sums 2
After another long day of collecting seashells on the beach,
Kayla separated the perfect seashells from the chipped
seashells. There were 28 chipped seashells and 17 perfect
seashells.Part A
Which equation uses a place value strategy to represent the
total number of seashells Kayla collected?o 28 + 17 = 30 + 16
o 28 + 17 = 10 + 17
o 28 + 17 = 30 + 7
o 28 + 17 = 28 + 8
o 28 + 17 = 30 + 15Part B
What if Kayla found 4 more perfect seashells and 5 more
chipped seashells?
Write an equation that uses a place value strategy to represent
the new total of seashells Kayla collected.© 2016, Math Intervention: Grades 3–5, Jennifer Taylor-Cox, Routledge