Teacher Guide
Week 13
3-Digit Addition & Subtraction — Teacher Guide
Monday: 3-Digit Addition (No Regrouping)
1
Warm-up ±100
1.
300, 400, 400, 600
2
Examples
1.
245+132=377, 314+253=567
3
Guided Practice
1.
359, 737, 377, 477
4
Estimation
1.
Est 300+200=500, actual 560 | Est 600+300=900, actual 896
5
Word Problem
1.
342+218=560 books
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Tuesday: 3-Digit Addition with Regrouping
1
Warm-up
1.
500, 500, 200, 800
2
Strategy
1.
248+135=383, 376+245=621
3
Practice
1.
383, 621, 495, 722
4
Estimation
1.
Est 200+100=300, actual 383 | Est 400+200=600, actual 621
5
Word Problems
1.
348+267=615 people, 425+318=743 books
2.
Two Ways: 253+128=381 both ways (columns; or 200+100=300, 50+20=70, 3+8=11 → 381)
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Wednesday: 3-Digit Subtraction
1
Warm-up
1.
400, 300, 700, 400
2
Concept
1.
573-241=332, 604-237=367
3
Practice
1.
332, 367, 447, 307
4
Find Error
1.
542-278=264 ✓ correct | 705-348=357 ✓ correct
5
Word Problem
1.
648-275=373 pencils
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Thursday: Mixed 3-Digit Add & Subtract
1
Warm-up
1.
50, 420, 300, 70
2
Mixed Practice
1.
383, 621, 332, 367
3
Number Talk
1.
B bigger (adding more) | B bigger (subtracting less)
4
Word Problems
1.
425+318=743 vegetables, 832-367=465 boxes
5
Unknown
1.
344+234=578 | 645-333=312
2.
Create Your Own: accept any valid 3-digit subtraction problem with correct answer
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Friday: Review & Self-Check
1
Warm-up
1.
500, 600, 200, 800
2
Estimation
1.
Est 200+100=300, actual 383 | Est 600-200=400, actual 367
3
Mixed Review
1.
390, 272, 513, 242
4
Word Problem
1.
524-186-97=241 books
5
Self-Check
1.
Accept student self-assessment and reflection