subtraction

80 - .......... = 27

• 
• 
• 

using break a part

42 - .........= 40

40 -......... = 37

• 
• 
• 

63 - 27 =

use the hundred chart

• from 63 move up 7tens and 2 ones to the left

  the answer is 26

• from 63 move up 2 tens and 7 ones to the left the answer is 36

• from 63 move down 3 tens and 5 ones to the right the answer is 42

• 
• 
• 

• 70 + 20 = 90

• 70 + 20 = 80

• 70 - 20 = 50

• 20 - 4 = 16

• 20 - 4 = 14

• 20 + 4 = 24

• 44

• 21

• 35

• 20

• 30

• 40

• 32

• 19

• 73

• 29

• 77

• 65