Triple Digit Trek Worksheets
3rd Grade Math Triple-Digit Expedition
Page 1 of 10
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LEVEL 1
3-Digit Addition • No Regrouping
Add the ones first, then the tens, and finally the hundreds.
Base Camp
1 H T O
324
2 H T O
516
3 H T O
403
4 H T O
621
5 H T O
235
6 H T O
710
7 H T O
152
8 H T O
381
9 H T O
544
10 H T O
430
11 H T O
263
12 H T O
605
Trail Tip Keep your place-value columns neat and lined up straight!
Level 1 Complete ✓
3rd Grade Math Triple-Digit Expedition
Page 2 of 10
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LEVEL 2
Regrouping Ones to Tens
When the ones sum to 10 or more, carry 1 ten into the box above the tens column.
Foothills Ascent
1
248
2
357
3
419
4
536
5
627
6
175
7
346
8
468
9
259
10
524
11
738
12
316
Remember Always add the carried 1 ten when adding the numbers in the tens column!
Level 2 Complete ✓
3rd Grade Math Triple-Digit Expedition
Page 3 of 10
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LEVEL 3
Regrouping Tens to Hundreds
When the tens sum to 10 or more, carry 1 hundred into the box above the hundreds column.
Mid-Mountain
1
372
2
481
3
293
4
564
5
182
6
395
7
476
8
253
9
684
10
360
11
575
12
191
Watch Out The ones column did not need regrouping here—only the tens needed a trade!
Level 3 Complete ✓
3rd Grade Math Triple-Digit Expedition
Page 4 of 10
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LEVEL 4
Double Regrouping • Ones and Tens
Carefully trade 10 ones for 1 ten, and then trade 10 tens for 1 hundred.
High Ridge
1
378
2
459
3
286
4
567
5
484
6
196
7
675
8
358
9
297
10
468
11
583
12
387
Pro Tip Check your work: Did you remember to add both carried values?
Level 4 Complete ✓
3rd Grade Math Triple-Digit Expedition
Page 5 of 10
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LEVEL 5
Addition Summit • Mastery & Word Problems
Solve the mixed addition problems, then show your work for the word problems.
Addition Peak
Part A: Mixed Computation
1
538
2
467
3
294
4
386
5
649
6
175
Part B: Real-World Word Problems
7 Library Book Drive
Pinecrest Elementary library has 368 fiction books and 285 non-fiction books. How many total books are in the library?
Show Your Work:
Answer: books
8 Track Team Relay
During the track meet, Leo ran 475 meters in the morning and 389 meters in the afternoon. How many meters did Leo run in all?
Show Your Work:
Answer: meters
Addition Milestone Outstanding work! You have conquered all 3-digit addition challenges!
★ Halfway Summit Reached ★
3rd Grade Math Triple-Digit Expedition
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LEVEL 6
3-Digit Subtraction • No Regrouping
Subtract the ones first, then tens, then hundreds. No borrowing needed here!
Valley Trail
1 H T O
578
− 243
2 H T O
865
− 421
3 H T O
697
− 354
4 H T O
489
− 162
5 H T O
756
− 513
6 H T O
984
− 631
7 H T O
375
− 142
8 H T O
648
− 325
9 H T O
892
− 470
10 H T O
567
− 234
11 H T O
789
− 456
12 H T O
946
− 715
Trail Check Always subtract bottom number from top number!
Level 6 Complete ✓
3rd Grade Math Triple-Digit Expedition
Page 7 of 10
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LEVEL 7
Regrouping Tens to Ones
When the top ones digit is smaller than the bottom ones digit, borrow 1 ten from the tens place.
Canyon Trade
1
582
− 247
2
673
− 328
3
854
− 419
4
491
− 265
5
765
− 348
6
980
− 536
7
372
− 146
8
651
− 237
9
894
− 568
10
576
− 329
11
783
− 457
12
462
− 138
Helpful Rule Cross out the tens digit, make it 1 less, and add 10 to the ones digit!
Level 7 Complete ✓
3rd Grade Math Triple-Digit Expedition
Page 8 of 10
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LEVEL 8
Regrouping Hundreds to Tens
When the top tens digit is smaller than the bottom tens digit, borrow 1 hundred to make 10 tens.
Timberline Pass
1
627
− 382
2
738
− 461
3
519
− 274
4
846
− 392
5
635
− 183
6
928
− 571
7
417
− 153
8
759
− 485
9
834
− 591
10
526
− 280
11
648
− 374
12
915
− 662
Notice The ones column had plenty to subtract, but the tens column needed help from the hundreds!
Level 8 Complete ✓
3rd Grade Math Triple-Digit Expedition
Page 9 of 10
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LEVEL 9
Regrouping Across Zeros • Double Regrouping
When there is a 0 in the tens place, trade from the hundreds first to make 10 tens, then borrow for the ones!
Glacier Ridge
1
604
− 238
2
700
− 345
3
503
− 167
4
800
− 426
5
402
− 189
6
905
− 548
7
612
− 285
8
724
− 368
9
531
− 276
10
800
− 357
11
642
− 387
12
901
− 463
Zero Rule A zero cannot lend! Travel left to the hundreds place, borrow 1 hundred, then bring it back!
Level 9 Complete ✓
3rd Grade Math Triple-Digit Expedition
Page 10 of 10
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LEVEL 10
Final Summit Challenge • Subtraction Mastery
Solve the mixed subtraction problems, then show your work for the word problems.
Grand Summit
Part A: Mixed Computation
1
768
− 325
2
583
− 247
3
629
− 384
4
705
− 348
5
832
− 467
6
900
− 574
Part B: Real-World Word Problems
7 Cafeteria Fruit Inventory
The school cafeteria ordered 620 crisp red apples on Monday. By Friday lunch, students had eaten 485 apples. How many apples were left over?
Show Your Work:
Answer: apples
8 Mountain Hot Air Balloon
A colorful hot air balloon was flying high over the mountains at an altitude of 805 feet. The pilot lowered it by 348 feet. What was its new altitude?
Show Your Work:
Answer: feet
★ CONGRATULATIONS ★ You have mastered 3-digit addition and subtraction across all 10 expedition levels!
Summit Master • 100%
