Grade 7Reading: grades 1-2AdditionSubtractionMultiplicationIntegersDivision
The Secret Agent Treehouse Mystery
Welcome to the Agent Treehouse. Someone took the Golden Binoculars! The Head Trainer needs your help to find the rogue agent. Look for clues to solve this mystery. Use your spy math to find the target. Good luck, agent!
Suspects
Possible suspects
Cross off a row as each clue rules it out. On screen, tap a row.
21 of 21 still in play
| Name | Gadget | Skill | Writing Hand | Hair Color | Favorite Snack |
|---|---|---|---|---|---|
| Leo | Grappling Hook | Safe Cracking | Right-handed | Blonde Hair | Cookie |
| Ben | Laser Pen | Safe Cracking | Right-handed | Brown Hair | Cookie |
| Ava | Night Goggles | Zip Lining | Right-handed | Brown Hair | Apple |
| Eli | Grappling Hook | Zip Lining | Left-handed | Brown Hair | Apple |
| Max | Grappling Hook | Safe Cracking | Left-handed | Red Hair | Cookie |
| Rose | Night Goggles | Zip Lining | Right-handed | Red Hair | Cookie |
| Eva | Laser Pen | Safe Cracking | Left-handed | Red Hair | Popcorn |
| Roy | Jet Shoes | Stealth Walking | Left-handed | Red Hair | Apple |
| Tim | Laser Pen | Code Breaking | Right-handed | Blonde Hair | Apple |
| Dan | Grappling Hook | Safe Cracking | Right-handed | Red Hair | Cookie |
| Ned | Spy Camera | Stealth Walking | Left-handed | Red Hair | Popcorn |
| Meg | Laser Pen | Stealth Walking | Left-handed | Red Hair | Apple |
| Joy | Spy Camera | Code Breaking | Left-handed | Blonde Hair | Apple |
| Will | Grappling Hook | Tree Climbing | Right-handed | Brown Hair | Apple |
| Jax | Laser Pen | Stealth Walking | Left-handed | Brown Hair | Popcorn |
| Tess | Jet Shoes | Safe Cracking | Right-handed | Red Hair | Cookie |
| Zoe | Night Goggles | Code Breaking | Right-handed | Red Hair | Cookie |
| Sam | Laser Pen | Zip Lining | Right-handed | Red Hair | Popcorn |
| Gus | Spy Camera | Safe Cracking | Left-handed | Blonde Hair | Popcorn |
| Mia | Laser Pen | Tree Climbing | Left-handed | Blonde Hair | Cookie |
| Amy | Night Goggles | Tree Climbing | Right-handed | Red Hair | Cookie |
Clue 1
Addition
We need to count our spy gadgets. Add the new walkie talkies to find the total.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
T
4941
7971
2273
5613
5596
5348
5348
3007
5596
6378
5367
6010
2273
7138
6378
6010
T
4941
9726
7138
2273
4549
6010
5367
2273
8461
6561
2273
3007
7448
5596
6378
3993
2304 + 2637 =T
1402 + 2591 =G
3764 + 1849 =V
2376 + 2972 =L
2604 + 2992 =I
1696 + 2853 =C
3462 + 4999 =B
1185 + 1822 =A
2263 + 3747 =O
2884 + 3494 =N
5523 + 2448 =H
4144 + 5582 =U
1198 + 1075 =E
2671 + 4467 =S
3807 + 2754 =R
3684 + 3764 =K
2670 + 2697 =D
0/17 letters found
Clue 2
Subtraction
Some map pieces are missing. Subtract the lost pieces from the map pile.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
T
7215
2102
6057
3942
8300
8067
5347
6057
8913
8067
6057
2393
T
7215
6649
3942
3095
T
7215
6057
3768
6649
3095
T
7215
2102
T
7215
2102
6057
3942
3095
8067
2102
T
7215
2102
8913
2393
8963
9958 - 2743 =T
9638 - 675 =D
6996 - 4894 =H
10624 - 4567 =E
5543 - 1775 =S
8507 - 4565 =R
11144 - 3077 =G
3034 - 641 =N
6705 - 56 =W
5813 - 466 =U
13096 - 4183 =A
6389 - 3294 =I
12670 - 4370 =O
0/13 letters found
Clue 3
Multiplication facts (1-12)
We have boxes of spy gear. Multiply the rows of boxes to count them all.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
T
72
120
81
77
16
45
144
81
108
45
81
27
T
72
132
T
72
16
32
32
81
60
T
72
16
81
108
T
72
108
48
16
16
50
80
81
8 × 9 =T
6 × 10 =D
9 × 12 =A
8 × 2 =O
10 × 12 =H
9 × 9 =E
11 × 12 =S
4 × 8 =P
4 × 12 =C
9 × 5 =G
7 × 11 =R
10 × 5 =K
10 × 8 =I
9 × 3 =N
12 × 12 =U
0/15 letters found
Clue 4
Integers
The basement lab gets very cold. Use the thermometer to check the temperature.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
R
23
6
11
7
19
12
R
23
10
19
20
21
30
3
13
11
30
13
22
7
6
5
12
13
30
14
3
24
19
R
23
20
(-7) + 30 =R
(-10) + 16 =E
6 - (-4) =W
2 - (-5) =H
2 - (-10) =I
(-4) + 18 =C
(-1) + 31 =O
5 - (-15) =S
(-4) + 17 =N
9 - (-12) =F
20 - (-2) =T
(-15) + 20 =B
(-2) + 5 =U
18 - (-6) =L
10 - (-9) =A
(-1) + 12 =D
0/16 letters found
Clue 5
Division facts (1-12) — the last clue
We have clues to share. Divide the clue cards among the team members.
First solve each problem. Then find each answer in the list below and cross that sentence out. One sentence will be left — that's exactly what the villain did!
Step 1 — solve these
30 ÷ 3 = ?
8 ÷ 8 = ?
30 ÷ 10 = ?
108 ÷ 12 = ?
48 ÷ 4 = ?
24 ÷ 6 = ?
110 ÷ 10 = ?
10 ÷ 5 = ?
12 ÷ 2 = ?
10 ÷ 2 = ?
7 ÷ 1 = ?
Step 2 — cross out the sentence with each answer
1.The villain turns on the night goggles, then climbs the tall oak tree.
2.The villain uses the spy camera, then slides down the long zip line.
3.The villain activates the jet shoes, then opens the secret safe.
4.The villain fires the laser pen, then sneaks past the motion sensors.
5.The villain turns on the night goggles, then sneaks past the motion sensors.
6.The villain uses the spy camera, then climbs the tall oak tree.
7.The villain fires the laser pen, then opens the secret safe.
8.The villain throws the grappling hook, then opens the secret safe.
9.The villain throws the grappling hook, then cracks the training code.
10.The villain turns on the night goggles, then slides down the long zip line.
11.The villain fires the laser pen, then climbs the tall oak tree.
12.The villain throws the grappling hook, then climbs the tall oak tree.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Secret Agent Treehouse Mystery
Culprit: Dan (Grappling Hook · Safe Cracking · Right-handed · Red Hair · Cookie)
- Clue 1 (Addition): "THE VILLAIN DOES NOT USE CODE BREAKING"2304 + 2637 = 4941 (T) · 1402 + 2591 = 3993 (G) · 3764 + 1849 = 5613 (V) · 2376 + 2972 = 5348 (L) · 2604 + 2992 = 5596 (I) · 1696 + 2853 = 4549 (C) · 3462 + 4999 = 8461 (B) · 1185 + 1822 = 3007 (A) · 2263 + 3747 = 6010 (O) · 2884 + 3494 = 6378 (N) · 5523 + 2448 = 7971 (H) · 4144 + 5582 = 9726 (U) · 1198 + 1075 = 2273 (E) · 2671 + 4467 = 7138 (S) · 3807 + 2754 = 6561 (R) · 3684 + 3764 = 7448 (K) · 2670 + 2697 = 5367 (D)
- Clue 2 (Subtraction): "THE ROGUE AGENT WRITES WITH THE RIGHT HAND"9958 - 2743 = 7215 (T) · 9638 - 675 = 8963 (D) · 6996 - 4894 = 2102 (H) · 10624 - 4567 = 6057 (E) · 5543 - 1775 = 3768 (S) · 8507 - 4565 = 3942 (R) · 11144 - 3077 = 8067 (G) · 3034 - 641 = 2393 (N) · 6705 - 56 = 6649 (W) · 5813 - 466 = 5347 (U) · 13096 - 4183 = 8913 (A) · 6389 - 3294 = 3095 (I) · 12670 - 4370 = 8300 (O)
- Clue 3 (Multiplication facts (1-12)): "THE ROGUE AGENT STOPPED TO EAT A COOKIE"8 × 9 = 72 (T) · 6 × 10 = 60 (D) · 9 × 12 = 108 (A) · 8 × 2 = 16 (O) · 10 × 12 = 120 (H) · 9 × 9 = 81 (E) · 11 × 12 = 132 (S) · 4 × 8 = 32 (P) · 4 × 12 = 48 (C) · 9 × 5 = 45 (G) · 7 × 11 = 77 (R) · 10 × 5 = 50 (K) · 10 × 8 = 80 (I) · 9 × 3 = 27 (N) · 12 × 12 = 144 (U)
- Clue 4 (Integers): "RED HAIR WAS FOUND ON THE BINOCULARS"(-7) + 30 = 23 (R) · (-10) + 16 = 6 (E) · 6 - (-4) = 10 (W) · 2 - (-5) = 7 (H) · 2 - (-10) = 12 (I) · (-4) + 18 = 14 (C) · (-1) + 31 = 30 (O) · 5 - (-15) = 20 (S) · (-4) + 17 = 13 (N) · 9 - (-12) = 21 (F) · 20 - (-2) = 22 (T) · (-15) + 20 = 5 (B) · (-2) + 5 = 3 (U) · 18 - (-6) = 24 (L) · 10 - (-9) = 19 (A) · (-1) + 12 = 11 (D)
- Clue 5 (Division facts (1-12)): surviving statement (box 8) → Dan30 ÷ 3 = 10 · 8 ÷ 8 = 1 · 30 ÷ 10 = 3 · 108 ÷ 12 = 9 · 48 ÷ 4 = 12 · 24 ÷ 6 = 4 · 110 ÷ 10 = 11 · 10 ÷ 5 = 2 · 12 ÷ 2 = 6 · 10 ÷ 2 = 5 · 7 ÷ 1 = 7
About this mystery
- Grade level
- Grade 7 math
- Math topics
- Addition, Subtraction, Multiplication, Integers, Division
- Reading level
- grades 1-2
- Theme
- The Secret Agent Treehouse Mystery — set in Agent Treehouse Academy
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects