Number Detective Riddle Slides
Math Mystery Academy
Grade 2 Place Value Quest
Crack the Number Code!
Put on your detective hat! Use your clues about Hundreds, Tens, and Ones to solve every mystery number.
100
Hundreds Flat
Groups of 100
10
Tens Rod
Groups of 10
1
Ones Unit
Single units
Detective Tool Kit
Know Your Place Value Houses!
Every Digit Has a Spot!
HUNDREDS
100
1 Big Flat
10 tens bundled together!
TENS
10
1 Tall Rod
10 ones snapped together!
ONES
1
1 Little Cube
Single counting blocks!
Codebreaker Rule: Look closely at which house each clue is talking about!
H - T - O
W1
Warm-Up Riddle • Within 100
Case of the Leaping Frog
2-Digit Warm-Up
Read the Clues:
A
I have 4 tens in my tens place.
B
I have 7 ones in my ones place.
What secret number am I?
Code Breakdown
Tens
4
Ones
7
Expanded Value:
40 + 7 = 47
The Number is 47!
Detective Check: Point to the tens rod and tap 4 times. Then tap 7 ones!
Guided Practice Mission
10 Guided Riddle Challenges!
Get Your Whiteboards Ready
Detective Protocol
How We Play Guided Riddles:
1. Read
Read the clues on the question slide carefully.
2. Write
Write your 3-digit secret code on your board!
3. Reveal
Flip to the next slide to check your code together!
First up: Guided Riddle #1! Are you ready?
1
Guided Riddle 1 • Question
The Cozy Forest Cabin
Solve on Whiteboard
Three Clues: 3-Digit Code
H
I have 5 hundreds.
T
I have 3 tens.
O
I have 6 ones.
What mystery number am I?
Teacher prompt: Write the 3 digits in order: Hundreds, Tens, Ones. Hold your board high!
Guided Riddle 1 • Answer Reveal
Code Cracked!
Secret Code: 536
Hundreds Place
5
5 flats = 500
Tens Place
3
3 rods = 30
Ones Place
6
6 cubes = 6
Expanded Form: 500 + 30 + 6 = 536
"Five hundred thirty-six"
2
Guided Riddle 2 • Question
The Deep Sea Submarine
Solve on Whiteboard
Submarine Clues: 3-Digit Code
H
I have 2 hundreds.
T
I have 8 tens.
O
I have 4 ones.
What mystery number am I?
Think carefully: 2 in the hundreds, 8 in the tens, 4 in the ones!
Guided Riddle 2 • Answer Reveal
Code Cracked!
Secret Code: 284
Hundreds Place
2
Value = 200
Tens Place
8
Value = 80
Ones Place
4
Value = 4
Expanded Form: 200 + 80 + 4 = 284
"Two hundred eighty-four"
3
Guided Riddle 3 • Question
The Tricky Zero in the Middle!
Watch the Tens Place!
Mystery Clues: 3-Digit Code
H
I have 7 hundreds.
T
I have 0 tens in the tens place!
O
I have 5 ones.
What mystery number am I?
Detective Warning: Do not skip the zero! Zero holds the place for tens!
Guided Riddle 3 • Answer Reveal
Code Cracked!
Secret Code: 705
Hundreds Place
7
700
Tens Place
0
0 tens (placeholder!)
Ones Place
5
5
Expanded Form: 700 + 0 + 5 = 705
Not 75! It has 3 digits: 705!
4
Guided Riddle 4 • Question
The Royal Castle Gates
Solve on Whiteboard
Gatekeeper Clues: 3-Digit Code
H
I have 4 hundreds.
T
I have 9 tens.
O
I have 0 ones.
What mystery number am I?
Hint: Notice zero is in the ones place this time!
Guided Riddle 4 • Answer Reveal
Code Cracked!
Secret Code: 490
Hundreds Place
4
400
Tens Place
9
90
Ones Place
0
0 ones
Expanded Form: 400 + 90 + 0 = 490
"Four hundred ninety"
5
Guided Riddle 5 • Question
The Scrambled Clues Trap!
Clues are Scrambled!
Read the label of each clue carefully!
Clue 1
I have 2 tens.
Clue 2
I have 6 hundreds.
Clue 3
I have 1 one.
Don't write 261! Put them in H - T - O order!
Strategy: Which digit belongs in the hundreds spot first?
Guided Riddle 5 • Answer Reveal
Trap Avoided!
Secret Code: 621
Hundreds (Clue 2)
6
600
Tens (Clue 1)
2
20
Ones (Clue 3)
1
1
Expanded Form: 600 + 20 + 1 = 621
"Six hundred twenty-one"
6
Guided Riddle 6 • Question
The Addition Detective
Two-Step Clue
Mystery Clues: 3-Digit Code
H
My hundreds digit is 1.
T
My tens digit is 6.
O
My ones digit is 2 more than my tens digit.
Math Step: What is 6 + 2?
Detective Tip: Solve the math problem for the ones place before writing your final answer!
Guided Riddle 6 • Answer Reveal
Code Cracked!
Secret Code: 168
Hundreds
1
100
Tens
6
60
Ones (6 + 2)
8
8
Expanded Form: 100 + 60 + 8 = 168
"One hundred sixty-eight"
7
Guided Riddle 7 • Question
The Subtraction Mystery
Subtraction Clue
Mystery Clues: 3-Digit Code
H
I have 8 hundreds.
T
My tens digit is 4.
O
My ones digit is 3 less than my tens digit.
Math Step: What is 4 - 3?
Teacher prompt: Write the 3 digits on your whiteboard. Show in 3, 2, 1!
Guided Riddle 7 • Answer Reveal
Code Cracked!
Secret Code: 841
Hundreds
8
800
Tens
4
40
Ones (4 - 3)
1
1
Expanded Form: 800 + 40 + 1 = 841
"Eight hundred forty-one"
8
Guided Riddle 8 • Question
Expanded Value Clues
Value Detective
Look at the Values: Standard Form
100s
The value of my hundreds is 900.
10s
The value of my tens is 70.
1s
The value of my ones is 3.
What is my number in standard form?
Quick Check: How many hundreds are in 900? Write that single digit first!
Guided Riddle 8 • Answer Reveal
Code Cracked!
Secret Code: 973
Hundreds Place
9
Value: 900
Tens Place
7
Value: 70
Ones Place
3
Value: 3
Expanded Form: 900 + 70 + 3 = 973
"Nine hundred seventy-three"
9
Guided Riddle 9 • Question
The Twin Digits Mystery
Matching Digits!
Mystery Clues: 3-Digit Code
H
My hundreds digit is 3.
T
My tens digit is 7.
O
My ones digit is the same as my tens digit!
What mystery number am I?
Detective Clue: Two of the houses have the same twin number inside!
Guided Riddle 9 • Answer Reveal
Code Cracked!
Secret Code: 377
Hundreds Place
3
300
Tens Place
7
70
Ones (Twin!)
7
7
Expanded Form: 300 + 70 + 7 = 377
"Three hundred seventy-seven"
10
Guided Riddle 10 • Question
The Ultimate Math Quest!
Grand Challenge
Crack All Three Clues: 3-Digit Code
H
I have 3 hundreds.
T
My tens digit is equal to 4 + 2.
O
My ones digit is equal to 5 - 5.
Solve both facts: 4 + 2 = ? and 5 - 5 = ?
Final Detective Check: Write your answer and freeze your board face down!
Guided Riddle 10 • Answer Reveal
Master Code Cracked!
Secret Code: 360
Hundreds Place
3
300
Tens (4 + 2)
6
60
Ones (5 - 5)
0
0
Expanded Form: 300 + 60 + 0 = 360
"Three hundred sixty"
Partner Codebreaker Mission
Turn & Talk Riddle #1
2 Minutes Teamwork
Partner Mission Riddle
"I have 7 hundreds, 4 tens, and 8 ones. What number am I?"
Partner A Tell the Number:
"I think the secret number is ___ because the hundreds digit is 7, the tens digit is 4, and the ones digit is 8."
Partner B Explain the Value:
"I agree! The value of 7 hundreds is 700, 4 tens is 40, and 8 ones is 8. In expanded form that is 700 + 40 + 8!"
Did your team crack the code?
Secret Number: 748
Expert Partner Challenge
The Scrambled Clues Trap!
Tricky Order!
Warning: Clues are Not in Order!
Read carefully before writing the digits down:
Clue 1
I have 6 ones.
Clue 2
I have 9 hundreds.
Clue 3
I have 3 tens.
Partner Tip: Reorder the clues into H - T - O order first!
Correct Order: 9 Hundreds, 3 Tens, 6 Ones
Secret Number: 936
Exit Ticket • Quick Check
Show What You Know #1
Independent Detective
Write your answer on your dry-erase board or paper:
"I have 4 hundreds, 2 tens, and 9 ones."
What 3-digit number am I?
Option A 492
Option B 429
Option C 249
When teacher says "CHIN IT!", hold up your board: Answer is B (429)!
Master Codebreaker Challenge
Final Boss Riddle!
Final Check
Can you unlock the Master Vault?
"I have 8 hundreds.
My ones digit is 0.
My tens digit is equal to 5 + 2."
Hundreds
8
Tens (5 + 2)
7
Ones
0
Vault Code: 870!
Congratulations, Certified 2nd Grade Place Value Detectives!
Mission Accomplished
