Students separate objects into groups of ten and extra objects. Then, they count the total number of objects to form a 2-digit number within 20
B. View an incomplete number line and put missing 2-digit numbers within 20 in the correct spot
C. Use 10-frames and remaining dots to add and solve for 2-digit numbers within 20
D. Count 11 to 19 objects in different arrangements
E. Decompose numbers 11-20 using models involving 10-frames
F. Decompose numbers 11-20 without using models
G. Complete number sentences involving numbers 11-20