Teacher Guide
Week 9
Addition with Regrouping — Teacher Guide
Monday: Introduction to Regrouping (Visual)
1
Visual Regrouping
1.
28+35=63, 47+26=73
2
Simple Regrouping
1.
63, 73, 83, 85
3
Predict Regrouping
1.
23+45=no, 28+35=yes, 41+56=no, 39+44=yes
4
Number Talk
1.
28+45 is bigger (adding more to same number)
2.
47+26 is bigger (starting with more)
5
Challenge
1.
38+46=84, 57+35=92
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Tuesday: Column Addition with Regrouping
1
Carry the 1
1.
63, 73, 83, 85
2
Estimation
1.
Est 30+40=70, actual 63 / Est 50+60=110, actual 103 / Est 70+30=100, actual 97 / Est 80+50=130, actual 123
3
Step-by-Step
1.
63, 73
4
Strategies
1.
97, 94, 96, 103
5
Number Talk
1.
39+25=64 (one more)
2.
57+26=83 (ten more)
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Wednesday: Mixed Regrouping Practice
1
Mixed
1.
68(no), 63(yes), 97(no), 83(yes)
2
Three Addends
1.
77, 92
3
Find Error
1.
28+35=63 not 53 (forgot to carry 1)
2.
58+39=97 not 87 (forgot to carry 1)
4
Convert to Column
1.
105, 105
5
Create Own
1.
Various — any column addition needing regrouping
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Thursday: Word Problems with Regrouping
1
Word Problems
1.
63 seashells, 83 picture books, 106 goals
2
Two-Step
1.
Step 1: 28+35=63, Step 2: 63+27=90 stickers
3
Number Talk
1.
Same sum (38+49 = 48+39 = 87)
2.
Same sum (26+57 = 27+56 = 83)
4
Create Own
1.
Accept student-created problems with regrouping
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Friday: Review & Self-Check
1
Mental Math
1.
40, 50, 60, 70
2
Estimation
1.
Est 40+50=90, actual 85 / Est 60+40=100, actual 101 / Est 50+40=90, actual 93 / Est 30+70=100, actual 93
3
Column Review
1.
85, 101, 93, 93
4
Word Problems
1.
57 students, 85 apples
5
Self-Check
1.
Accept student self-assessment and reflection