1. Abacards® Subtraction Click your 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

2. Abacards® Subtraction 4 10 = 24 – 10 – 4 – 4 = ?6 -4 -10 -4 24 – 18 = ?6 6 0 0

3. Abacards® Subtraction =18 + ? = 24 10 8 +2 +4 6 4 10 24 24 – 18 = ?6 6 Mental math “Friendly”

4. Abacards® Subtraction 10 = 24 – 20 + 2 = ?6 -10 10 -10 4 +2 24 – 18 = ?6 24 6 Mental math “Friendly”!

5. Abacards® Subtraction 5 10 15 – 7 = ?8 - 2 - 5 8 15 – 5 – 2 = ? 8 Mental math “Friendly”!

6. Abacards® Subtraction 15 – 7 = ?15 – 10 + 3 = ? 8 8 5 10 - 10 + 3 8 Mental math “Friendly”!

7. Abacards® Subtraction 5 7 7 + ? = 158 +3 +5 10 15 – 7 = ?8 Mental math “Friendly”!

8. Abacards® Subtraction 10 34 – 19 = 34 – 20 + 1 = ?15 -10 10 4 +1 10 -10 5 15 Mental math “Friendly”!

9. Abacards® Subtraction 10 27 – 9 = 27 – 10 + 1 = ?18 -10 10 8 +1 27 7 17 18 Mental math “Friendly”!

10. Abacards® Subtraction 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!

11. Abacards® Subtraction 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!