N1-LC20 Easy Set A
N1-20 Visualizes and adds numbers with sums through 99 without or with regrouping

N1-LC20 Easy Set A

N1-LC20 Easy Set B
N1-20 Visualizes and adds numbers with sums through 99 without or with regrouping

N1-LC20 Easy Set B

N1-LC20 Average
N1-20 Visualizes and adds numbers with sums through 99 without or with regrouping

N1-LC20 Average

N1-LC20 Difficult
N1-20 Visualizes and adds numbers with sums through 99 without or with regrouping

N1-LC20 Difficult