Adding and Subtracting Double Digit Numbers

Double Digit Addition

when you want to add or subtract 2-digit number always start with the ones digits

REmember

Fill in the Blank

32 + 1 5=

Fill in the Blank

34+23=

Multiple Choice

55+11=

• 66

• 44

• 55

• 77

Multiple Choice

27+51=

• 78

• 87

• 71

Multiple Choice

22+14=

• 36

• 33

• 92

Multiple Choice

20+20=

• 20

• 4

• 44

• 40

Multiple Choice

32+35=

• 67

• 56

• 76

• 65

Multiple Choice

52+34=

• 86

• 88

• 68

• 66

Multiple Choice

46+32=

• 87

• 77

• 88

• 78

Multiple Choice

True or False: It is important to keep the ones in the one's column and the tens in the ten's column when adding or subtracting?

• True

• False

Multiple Choice

Solve

22 + 23 =

• 54

• 45

• 46

• 64

​Double-Digit Numbers Double-digit numbers are numbers that are made up of two numbers (or have two digits), with a number in the one's place and a number in the tens place. On a number line, double-digit numbers would fall between 10 and 99. Some examples of double-digit numbers include: -

13 (1 in the tens place and 3 in the one's place) - 47 (4 in the tens place and 7 in the one's place) - 92 (9 in the tens place and 2 in the one's place) - 65 (6 in the tens place and 5 in the one's place) - 29 (2 in the tens place and 9 in the one's place)

​https://youtu.be/xAf-rCJ6VEc

​https://youtu.be/xAf-rCJ6VEc

Adding Integers - Same Signs

​Add the digits -- Keep the sign

4 + 17 =

​-10 + -7 = ​

​Adding Integers - Same Signs

​Add the digits -- Keep the sign

​4 + 17 = 21

-10 + -7 = -17​

Fill in the Blank

7 + 6 =

Fill in the Blank

-7 + -6 =

Match

Match the following

• -2 + -3 =

• 6 + 19 =

• -7 + -2 =

• 5 + 14 =

• -9 + -9 =

-5

25

-9

19

-18

• -5

• 25

• -9

• 19

• -18

​Adding Integers - Different Signs

Find the difference between the digits - larger digit determines the sign of the answer

-4 + 7 ​

Adding Integers - Different Signs

​Difference between Digits - Larger Digit Sign

-4 + 7​

Difference between digits (7-4=3)

Larger digit determines sign => +3​

Adding Integers - Different Signs

​​Difference between Digits - Larger Digit Sign

-19 + 10​ =

Adding Integers - Different Signs

Difference between Digits - Larger Digit Sign

​-19 + 10

Difference between digits (19-10=9)

Larger digit determines sign => -9​

Multiple Choice

-9 + 4 =

• 5

• -5

• 13

• -13

Fill in the Blank

45 + -5

Multiple Choice

-99 + 100 =

• 199

• -199

• 1

• -1

Multiple Choice

15

+12

• 34

• 19

• 27

Multiple Choice

10

+23

• 48

• 33

• 16

Multiple Choice

41

+ 36

• 77

• 88

• 99

Multiple Choice

83

+14

• 68

• 97

• 79

Multiple Choice

29

+30

• 59

• 62

• 83

Multiple Choice

45

-31

• 14

• 76

• 44

• 16

Multiple Choice

80

-50

• 60

• 100

• 30

• 10

Multiple Choice

33

-10

• 20

• 43

• 14

• 23

Multiple Choice

55

-32

• 23

• 32

• 87

• 19

Multiple Choice

34+25

• 59

• 76

• 61

• 68

Multiple Choice

15

+12

• 34

• 19

• 27

Multiple Choice

10

+23

• 48

• 33

• 16

Multiple Choice

41

+ 36

• 77

• 88

• 99

Multiple Choice

83

+14

• 68

• 97

• 79

Multiple Choice

29

+30

• 59

• 62

• 83

Multiple Choice

45

-31

• 14

• 76

• 44

• 16

Multiple Choice

80

-50

• 60

• 100

• 30

• 10

Multiple Choice

33

-10

• 20

• 43

• 14

• 23

Multiple Choice

55

-32

• 23

• 32

• 87

• 19

Multiple Choice

47

-22

• 69

• 25

• 49

• 12