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. Forward Backward

1 2 3 Adding Counting Numbers Make a perfect rectangle by adding the same number of abacus beads without moving the original beads. Now you have 2 x the beads you started with! We now have 3 rows of 4 and 3x4 = 12. We now take back ½ of 12 and get 6 as the sum of Does that method work again?

1 2 3 Adding Counting Numbers Make a perfect rectangle by adding the same number of abacus beads without moving the original beads. Now you have 2 x the beads you started with! We now have 4 rows of 5 and 4x5 = 20. We now take back ½ of 20 and get 10 as the sum of Does this method work again? 4 5

1 2 3 Adding Counting Numbers Make a perfect rectangle by adding the same number of abacus beads without moving the original beads. Now you have 2 x the beads you started with! We now have 5 rows of 6 and 6x5 = 30. We now take back ½ of 30 and get 15 as the sum of Does this method work again?

Adding Counting Numbers Well done! Let’s review the results = ½ of 3x4 = = ½ of 4x5 = = ½ of 5x6 = 15 Do you see the pattern? Let’s try ! == ½ of 10x11 = 55 Let’s try 1+2+……… ! 1+2+……………… == ½ of 100x101 = 5050 WOW! My Problem! My Way! My Way! Think!