On the first day of school, students used 31 small paperclips and 16 large ones. How many paperclips did they use altogether?
47
100
Which place do you start in to add two and three digit numbers?
The ones place
200
36+65
101
200
257
+ 64
321
200
12+24+36
72
200
Randy has 13 marbles in a jar. His friend gives him 49 more. How many marbles does randy have in all?
62
200
10 ones become ________
A ten
300
58+68
126
300
547
+334
931
300
35
43
+56
134
300
Sean made a gingerbread house with 192 jelly beans and 248 gum drops. How many pieces of candy did Sean use in all?
440
300
10 tens become _______
A hundreds block
400
67
+74
141
400
684
+256
940
400
12
20
34
+21
87
400
Andy painted his house using 26 gallons of white paint, 57 gallons of green paint, and 42 gallons of blue paint. How many gallons of paint in all did Andy use?
125
400
What is regrouping?
Changing groups of ones into tens.
Changing groups of tens into hundreds.
Changing groups of hundreds into thousands.
500
95+97
192
500
825
+486
1,311
500
42
25
54
+21
142
500
On rainy days, Alexa reads in her room to pass the time. Last year, she read 112 plays, 232 comic books, and 173 novels. How many books did she read in all?
517
500
How do you know when you need to regroup when you are adding?
When you have more than 10 ones, tens, or hundreds you need to regroup.