Addition and Subtraction
Use a number line to show:
20 + 17
37
Miss Caro has 14 presents on the table and 19 in the closet. How many in all?
Use the strategies we learned in class.
14 + 19 = 33 presents
List 3 doubles facts
1+1
2+2
3+3
4+4
5+5
6+6
7+7
8+8
9+9
3 tens
9 ones
39
On a number line represent
5 + 10 + 15
30
Matias and Manuela have a party at school. They have 100 presents total. There are 43 on the table. How many are in the closet?
100 - 43= 57 presents in the closet
List 3 doubles facts with EVEN numbers.
2+2
4+4
6+6
8+8
10+10
4 hundreds
2 tens
8 ones
428
Use one of the strategies we learned in class
72- 12
60
There are 3 sisters. There are 90 presents under the tree. How many are for each sister?
30 presents for each sister.
List 3 Doubles PLUS one facts
1+2
2+3
3+4
4+5
6 hundreds
13 tens
5 ones
735
Use a number line to show:
15 + 15 + 5
35
The boys were playing a game. Matteo and Felix hid some buddles of sticks. Felix hid 55 under one blanket, and Matteo hid 68 under another blanket. Who hid more sticks? How many more?
68 - 55 =13
Matteo hid 13 more sticks than Felix.
List 3 doubles MINUS ones facts
9-8
8-7
7-6
6-5
5-4
1 thousand
8 hundreds
14 tens
16 ones
1,946
Use a number line to represent
65 + 30 + 15
110
There are 100 students in 2nd grade. 20 in Ms Caro's class, 25 in Mary's class and 22 in Mr. Austin's class the rest are in Ms. Serna's class. How many students does Ms. Serna have?
33 students
15 + 16
31
2 thousands
5 hundreds
10 tens
6 ones
2,606