Critter Trail Operations Worksheet
Critter Trail Operations
Adding, Subtracting & The Power of Zero (Up to 20)
Name:
Date:
Mathematical Chart: 0–20 Trail Path Hop forward to add (+) • Hop backward to subtract (-)
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Part 1
Joining Groups & Zero: Count the Objects to Find the Sum
1. Acorn Harvest Count all
9 + 4 =
2. Forest Berries + Zero Zero Added
0 (none)
14 + 0 =
Part 2
Taking Away & Zero: Cross Out Objects to Find What Remains
3. Pinecone Trail Take away 7
✕ ✕ ✕ ✕ ✕ ✕ ✕
16 - 7 =
4. River Stones: Take Away All! All Removed
✕ ✕ ✕ ✕ ✕ ✕ ✕ ✕ ✕ ✕ ✕ ✕
12 - 12 =
Part 3
Mathematical Chart: Double Ten-Frame Practice
Each full box = 10 units
5. Full Ten + 8 Ones
10 + 8 =
6. Take Away None (Zero)
18 counters on frame. 0 removed!
Nothing is crossed out.
18 - 0 =
Critter Trail Mathematics • Page 1: Object Groups & Zero Turn over for Part-Part-Whole & Trail Stories →
Missing Parts & Operation Decisions
Double Ten-Frames • Choose the Operation (+ or -)
Student Name:
Math Rule: Adding 0 never changes the amount. Subtracting 0 leaves the whole group intact!
n + 0 = n • n - 0 = n • n - n = 0
Part 4
Find the Missing Part: Look at the 20-Frames
7. Target: 15 Dots
10 +
= 15
8. Target: 10 Remain
✕
✕
✕
✕
✕
✕
✕
17 -
= 10
9. Mystery Addition
13 +
= 13
Part 5
Trail Stories: Choose the Sign (+ or -) & Solve
10. Piper the Robin collects 11 twigs in the morning and 7 twigs in the afternoon. How many twigs does Piper have in all?
Hint: Are we joining groups or taking away?
11
7 =
11. Barnaby Bear finds 19 berries in a bush. He drops 0 berries on his walk home. How many berries does Barnaby still have?
Hint: He lost none of the berries!
19
0 =
12. 15 ladybugs rest on a log. All 15 ladybugs fly up into the sky. How many ladybugs remain on the log?
Hint: Every single ladybug left!
15
15 =
Part 6
Trail Master Quick Check
Use the 0–20 Trail Path if you need help!
13
16 + 0 =
14
20 - 4 =
15
18 - 18 =
16
12 + 6 =
Critter Trail Mathematics • Page 2: Strategy, Operations & Master Check
Total Score: / 16