abacards® subtraction click your or arrow keys to move the card ahead! for your ipad swipe the...

Abacards® SubtractionAbacards® Subtraction

Click your <space Bar> or arrow keys to move the card ahead!

For your IPAD swipe the screen.

Using Your Abacards ®

Click and follow along using your abacus.After each click say what you saw.

Practice saying what you will see before you click!After using the Abacards ®, make up problems.

Think!!!!!!

Forward Backward


4

10

10

= 24 – 10 – 4 – 4 = ? 6

-4

-10

-4

24 – 18 = ? 6

6

0

0


=18 + ? = 24

10

8 +2

+4

6

4

10

24

24 – 18 = ? 6

6

Mental math “Friendly”


10

= 24 – 20 + 2 = ? 6

-10

10 -10

4 +2

24 – 18 = ? 6

24

6

Mental math “Friendly”!


5

10

15 – 7 = ? 8

- 2

- 5

8

15 – 5 – 2 = ? 8



15 – 7 = ? 15 – 10 + 3 = ? 88

5

10 - 10

+ 38



5

7

7 + ? = 15 8

+3

+5

10

15 – 7 = ? 8


Abacards® Subtraction

10

34 – 19 = 34 – 20 + 1 = ? 15

-10

10

4 +1

10 -10

5 15


Abacards® Subtraction

10

27 – 9 = 27 – 10 + 1 = ? 18

-10

108 +1

27

7

17 18



15 - 9 = ( 15 - 10 ) + 1 = 6

27 - 9 = ( 27 - 10 ) + 1 = 18

34 - 19 = ( 34 - 20 ) + 1 = 15

52 - 8 = ( 52 - 10 ) + 2 = 44

66 - 28 = ( 66 - 30 ) + 2 = 38

Subtract “Friendly” Number and Adjust!


15 - 9 = ? 9+ ? = 15 ? = 1+5 = 6

27 - 9 = ? 9+ ? = 27 ? = 1+10+7 = 18

34 - 19 = ? 19+ ? = 34 ? = 1+10+4 = 15

52 - 8 = ? 8+ ? = 52 ? = 2+40+2 = 44

66 - 28 = ? 28+ ? = 66 ? = 2+30+6 = 38

Change subtraction to addition problem!

abacards® subtraction click your or arrow keys to move the card ahead! for your ipad swipe the...

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