Single Digit Whole Number Subtraction FlashCards

1
Single Digit Whole Number SubtractionFlashCards
2
The Whole Numbers are the natural numbers (1, 2,
3, ), and the number zero (0).
3

• When we subtract zero (0) from any number, the
  result (difference) is the number that zero was
  subtracted from.
• The rule reads
• a 0 a
• ( But be careful 0 a -a )
• So 7 0 7

4

• When we subtract any number from itself the
  result (difference) is zero.
• The rule reads
• a a 0
• So 5 5 0

5

• When we subtract two numbers, the order does
  matter.
• There is no rule (of Commutivity for
  Subtraction) because
• a - b ¹ b - a
• You can see with this example
• 8 - 5 3, but 5 - 8 -3 .

6

• You may have remembered being asked to memorize
  whole number subtraction facts in grade school.
• To perform a subtraction problem it is helpful
  to see the relationship to its related addition
  problem.

7

• For instance, in order to subtract 2 from 9
  that is perform the following subtraction
  problem
• 9 2 ?
• It helps if you know that
• 2 ? 9
• is the related addition problem.

8

• So since
• 2 7 9
• or
• 7 2 9 ,
• then
• 9 2 7
• And also
• 9 7 2

9
Fix Subtraction Flash Cards

• So that you use addition table inside out
  like w/ division flash cards
• OK?

10

• The next 55 slides will be randomly mixed flash
  cards for subtracting single digit whole
  numbers, where the difference is still a whole
  number (no negative numbers ? yet) which drill
  practice the facts from the subtraction problems
  you have been exposed to over the years. The
  answers will be revealed (UPSIDE DOWN) two
  seconds after the flash card pops up
• Use the NEXT button (below on the right) to get
  more flash cards.
• If you wish to end the session, use the END
  button
• (below on the left)

11

• 7 - 4 ?

12

• 8 - 0 ?

13

• 8 - 2 ?

14

• 5 - 1 ?

15

• 9 - 6 ?

16

• 7 - 6 ?

17

• 4 - 2 ?

18

• 9 - 3 ?

19

• 5 - 4 ?

20

• 3 - 0 ?

21

• 9 - 5 ?

22

• 6 - 6 ?

23

• 8 - 4 ?

24

• 2 - 1 ?

25

• 7 - 7 ?

26

• 6 - 2 ?

27

• 4 - 0 ?

28

• 9 - 4 ?

29

• 6 - 1 ?

30

• 6 - 5 ?

31

• 9 - 8 ?

32

• 5 - 0 ?

33

• 3 - 2 ?

34

• 6 - 3 ?

35

• 7 - 2 ?

36

• 1 - 0 ?

37

• 4 - 3 ?

38

• 9 - 7 ?

39

• 2 - 0 ?

40

• 8 - 6 ?

41

• 9 - 1 ?

42

• 7 - 3 ?

43

• 2 - 2 ?

44

• 8 - 7 ?

45

• 7 - 0 ?

46

• 7 - 5 ?

47

• 3 - 3 ?

48

• 8 - 5 ?

49

• 6 - 0 ?

50

• 3 - 1 ?

51

• 0 - 0 ?

52

• 7 - 1 ?

53

• 9 - 2 ?

54

• 4 - 4 ?

55

• 9 - 0 ?

56

• 8 - 3 ?

57

• 8 - 1 ?

58

• 9 - 9 ?

59

• 6 - 4 ?

60

• 1 - 1 ?

61

• 5 - 3 ?

62

• 8 - 8 ?

63

• 5 - 2 ?

64

• 4 - 1 ?

65

• 5 - 5 ?

66
Wow!

• You actually reviewed every one of those 55
  subtraction problem flash cards
• Good for you!
• Come back anytime to review these subtraction
  subtraction
• facts, if you begin to feel rusty, OK?
• Close the document by first pushing the ESC
• (Escape) button in the top left corner of
• your keyboard, and then click on the red
  
• in the top right corner of the dialog box.

67

• Thank you for reviewingyour subtraction facts
• May the force
• be with you
• Close the document by first pushing the ESC
  (Escape) button in the top left corner of your
  keyboard, and then click on the red
• in the top right corner of the dialog box.