Breaking Apart Ones to Add Breaking Apart Addends as Tens and Ones Quick Draw Pictures Addition Problems (Algorithms) Addition Problems with Regrouping
100
15 + 7=___
/\
5+2
20 + 2=22
15 + 7=___
100
14 ---> 10 + 4
23 ---> 20 + 3
+_____---->30 + 7 = 37
14
23
+______
100
l ooo
ll oooo
3 Tens
7 Ones=37
13
24
+_____
200
28 + 6=___
/\
2+4
30 + 4=34
28 + 6=___
200
25--> 20 + 5
33--> 30 + 3
+_____--> 50 + 8 = 58
25
33
+_____
200
ll oooo
lll oo
5 Tens
6 Ones=56
24
32
+_____
300
37 + 8=____
/\
3+5
40 + 5= 45
37 + 8= _____
300
38--> 30 + 8
41--> 40 + 1
+_____--> 70 + 9 = 79
38
41
+_____
400
43 + 9=___
/\
7+2
50 + 2=52
43 + 9=___
400
44--> 40 + 4
52--> 50 + 2
+_____--> 90 + 6 = 96
44
52
+_____
500
58 + 7=___
/\
2+5
60 + 5=65
58 + 7=___
500
57--> 50 + 7
42--> 40 + 2
+_____--> 90 + 9 = 99
Write an addition problem for the following story. Then solve the problem by breaking apart the tens and ones:

Mr. Brown has 57 marbles in his collection. Mr. Black gives him 42 more marbles. How many marbles does Mr. Brown have in his collection now?






Chapter 4: Addition Strategies

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