Unit Week Adding 1, 2, and 3 5 6 Complete the number sentences to add 1, 2, and 3. 1 2 3 4 5 6 7 8 9 10 2+1= 1 2 3 4 5 6 7 8 9 10 2+3= 1 2 3 4 5 6 7 8 9 10 4+2= 1 2 3 4 5 6 7 8 9 10 5+3= 1 2 3 4 5 6 7 8 9 10 62