Operation Sleuth

Step 2: Remaining Distance

Final Answer with Units

Day 1 • Advanced Investigation Stations

Cases 105 & 106 • Clearance Audit

Page 3 of 3

CASE FILE 105 Topic: City Aquarium Transfer

The City Aquarium has 154 clownfish and 89 blue tang fish in the tropical coral tank. The marine biologist moved 48 fish into a nursery tank. How many tropical fish remain in the coral reef exhibit?

Step 1: Total Fish in Exhibit

Step 2: Subtract Nursery Fish

Final Fish in Exhibit

CASE FILE 106 (CHALLENGE) Topic: School Supply Drive

A school supply drive began with 250 spiral notebooks. On Wednesday, families donated 75 more notebooks. On Friday, the principal distributed 162 notebooks to classrooms. How many notebooks are left in storage?

Step 1: Total Notebooks

Step 2: Subtract Distributed

Final Notebooks Left

Detective Case Clearance Checklist

I circled every number & underlined the question. I boxed the clue words (e.g. remain, spent, left). I wrote both Step 1 and Step 2 calculations clearly. I included the correct label/units on every final answer.

Case 206: (72 ÷ 8) × 5 = 45 drone parts

Step 1: Total Oranges

Step 2: Divide into Bags

Final Bags Packed

CASE FILE 206 (CHALLENGE) Topic: Robotics Drone Assembly

A robotics company packs 72 replacement rotor parts into 8 identical starter kits. A middle school engineering club purchases 5 of these starter kits. How many total rotor parts did the engineering club receive?

Step 1: Parts per Starter Kit

Step 2: Total for 5 Kits

Final Drone Parts

Detective Case Clearance Checklist

I found whether I needed to find a total (×) or unit rate (÷) first. I showed my multiplication/division facts clearly. I verified that my final quotient or product makes sense. I labeled the final unit (e.g., pencils, books, teams, bags).

Case 306: (90 − 18) ÷ 9 = 8 juice boxes

Step 1: Total Cost of Guitars

Step 2: Subtract Grant Amount

Final Amount Paid

CASE FILE 306 (CHALLENGE) Topic: Cafeteria Lunch Coolers

The cafeteria started with 90 chilled juice boxes. They handed out 18 juice boxes to the kindergarten classes. They packed the remaining juice boxes equally into 9 field trip coolers. How many juice boxes went into each cooler?

Step 1: Juice Boxes Remaining

Step 2: Boxes per Cooler

Final Boxes per Cooler

Detective Case Clearance Checklist

I identified the order of events before calculating. I chose the correct mix of operations (+, −, ×, ÷). I double-checked both intermediate and final steps. I wrote accurate units on every final box.

Case 405: (60 − 15) ÷ 5 = 9 balls [Extra: June 12]

Case 406: (4 × 8) × 5 = 160 markers [Extra: Table 9]

Distractor / Extra Info to Eliminate:  

Step 1: Balls Remaining

Step 2: Balls per Captain

Final Balls per Captain

CASE FILE 406 (CHALLENGE) Topic: Art Studio Marker Sets

At Table 9, 4 students each brought in 8 packs of colored markers for a group mural project. Each pack contained 5 markers. How many total markers did the students bring?

Distractor / Extra Info to Eliminate:  

Step 1: Total Marker Packs

Step 2: Total Markers (x5)

Final Marker Total

Detective Case Clearance Checklist

I found and crossed out every distractor piece of information. I wrote down the intermediate answer before finding the final answer. I checked both operations for accuracy. I added proper descriptive units to my final solutions.

Step 1: Total Tomato Plants

Step 2: Add Pepper Plants

Final Total Plants

CASE FILE 506 (MASTER CHALLENGE) Operation Mix: 3-Step Operations

In Room 204, a teacher opened 3 boxes of 24 gel pens. She kept 12 pens for grading and divided the remaining pens equally among 6 student teams. How many gel pens did each student team receive?

Distractor / Extra Info Eliminated:  

Step 1 & 2: Pens Remaining

Step 3: Pens per Team

Final Pens per Team

Operation Sleuth: Case Clearance Certificate

Certified that the detective above has successfully decoded and resolved multi-step word problems across all operations!

Inspector Stamp:  

Final Score: / 24 pts