subtration of numbers

subtraction of number

1. 6 - 4

T U

6 / / / / / / 2

- 4 / / / /

_____

2

_____

2. 83 - 13

T U

8 3 / / / 0 / / / / / / / / 7

- 1 3 / / / /

______

7 0

______

3. 417- 28

H T U

43 110 717 ///////////////// 9 ////////// 8

2 8 //////// //

___________ /// 3

3 8 9

___________

find the missing number

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word problem on subtraction

1. Susan has six oranges, three of the oranges are bad. How many are good?

Solution:

T

number of oranges = 6

bad oranges = - 3

__

good oranges = 3

__

2. Chi has ninety-five blue and red buttons. thirty-eight are blue. How many are blue?

solution:

T U

number of buttons = 9 5

number of blue buttons = - 3 8

__

5 7

__

3. A box of matches has five hundred and ten

sticks. Aunt Mary takes away two hundred and five every day. How many will be

left in the box after the first day?

Solution:

H T U

number of sticks = 5 10 010

number use every day = - 2 0 5

___________

3 0 5

___________

////////// 5 0 ///// 3

///// //