Math Intervention 3–5 Grade

Addition and Subtraction Concepts 99

Rigorous Problem Solving with the Concept of
Near Tens for Addition and Subtraction 1

The students at Blaise Elementary School shop in the school
store. Below is a chart of the sales during the fi rst week.

Item Started with Sold How many left Gel pens 56 39 Erasers 83 59 Notebooks 34 29

Part A

Which equation uses a place value strategy to represent how
many gel pens are left in the school store?

o 56 – 39 = 56 – 30 + 1
o 56 – 39 = 56 – 30 – 1
o 56 – 39 = 56 – 40 + 1
o 56 – 39 = 56 – 40 – 1
o 56 – 39 = 56 – 50 + 1

Part B

Use a place value strategy to represent how many erasers and
notebooks are left in the school store.

Erasers Notebooks