Basic Addition and Subtraction

Addition

100

2+2+6

10

200

9+2+4

15

300

15 + 10 + 25

50

400

20 + 6+10

36

500

8+7+9

24

Addition 2

100

10+15

25

200

12+19

31

300

25 + 26

51

400

56+42

98

500

28+23

51

Subtraction

100

20-9-3

14

200

22-11-8

3

300

31-23

8

400

88-67

21

500

61-48

13

Subtraction 2

100

12-8

4

200

56-39

17

300

32-18

14

400

97 - 24

73

500

47-23

24

Think Hard!!

100

When my operation makes my answer get greater what have I done?

Addition

200

Do I need to carry or borrow in this problem?

235+147

Yes, because  7+5= 12   

300

Do I need the algorithm to solve this?  799-499

No, I can skip count hundreds from 7 to 4 to get the answer of 300

400

Do I need to carry or borrow in this problem?

548-392

Yes, because 4 tens minus 9 tens you have to borrow.

500

BONUS Vocabulary: What is the answer to an addition and Subtraction problem called?

Sum & Difference