Level 2 introduces negative numbers. Addition problems will now include both interim negative sums as well as negative sum answers. Students will learn to generalize the concept of complements to include any size number. Negative numbers on the abacus are represented in their complement form. Level 2 continues to increase the complexity of decimal multiplication and division.

15120

-72049

-2490

13704

18192

9886

-82358

1.8659

× 8.65

÷ 88.31