A
Unit A: Numbers 1–3
Chapter 1: Comparing Numbers 1–3
Chapter 2: Comparing Numbers 1–3: Difference of 1 or 2
B
Unit B: Numbers 1–5
Chapter 1: Comparing Numbers 1–5
Chapter 2: Numbers 1–5 – Difference of 1 or 2
C
Unit C: Numbers 1–10
Chapter 1: Comparing Numbers 6–10
Chapter 2: Difference of 1 or 2
Chapter 3: Comparing Numbers 1–10
