Vocabulary
Addition within 20
Subtraction within 20
Addition within 100
Subtraction within 100
100

How many tens are in the number 71

There are 7 tens in the number 71

100

10+5

15
100

Ms. G had 12 cupcakes on her desk. 12 students each took one cupcake. How many cupcakes are left on Ms. G's desk?

0

100

20+30

50

100

100-90

10

200

The total in a subtraction problem is called the ___________.

Difference

200

10+1

11

200

Mrs. Thomas brought 15 donuts to school for the teachers. The 2nd grade teachers ate 5 donuts. How many donuts does Mrs. Thomas have now?

10 donuts

200

50+10

60

200

70-30

40

300

What do you call a number that is being added?

addend

300

12+8

20

300

27 friends came to class on Monday. 21 friends came to school on Tuesday. How many more friends came to school on Monday than Tuesday?

6 friends

300

18+4

22

300

30-8

22

400

A model to show parts and a whole is called a _____  __________.

Bar diagram 

400

15+3

18

400

15-8

7

400

66+30

96

400

48-6

42

500

When you 'give' or 'take away' you are ___________.

subtracting

500

11+9

20

500

20-3

17

500

8+65

73

500

85-60

25