4.08. Adding and subtracting whole tens – Supplement

4.09. Adding and subtracting whole hundreds – Foundation

4.09. Adding and subtracting whole hundreds – Practice

4.09. Adding and subtracting whole hundreds – Supplement

4.10. Adding and subtracting whole tens – Foundation

4.10. Adding and subtracting whole tens – Practice

4.10. Adding and subtracting whole tens – Supplement

4.11. Practice and application – Foundation

4.11. Practice and application – Practice

4.11. Practice and application – Supplement

4.12. Open exercises and practice – Foundation

4.12. Open exercises and practice – Practice

4.12. Open exercises and practice – Supplement

4.13. Brain-teasers – Foundation

4.08. Adding and subtracting whole tens – Foundation

4.08. Adding and subtracting whole tens – Practice

4.03. Number line 0–1000 – Practice

4.03. Number line 0–1000 – Supplement

4.04. Number line 0–1000 – Foundation

4.04. Number line 0–1000 – Practice

4.04. Number line 0–1000 – Supplement

4.05. Comparing numbers – Foundation

4.05. Comparing numbers – Practice

4.05. Comparing numbers – Supplement

4.06. Adding a one-digit number – Foundation

4.06. Adding a one-digit number – Practice

4.01. Three-digit numbers – Practice

4.06. Adding a one-digit number – Supplement

4.01. Three-digit numbers – Supplement

4.07. Subtracting a one-digit number – Foundation

4.02. Zero as a place value – Foundation

4.07. Subtracting a one-digit number – Practice

4.02. Zero as a place value – Practice

4.07. Subtracting a one-digit number – Supplement

4.02. Zero as a place value – Supplement

4.03. Number line 0–1000 – Foundation

4.01. Three-digit numbers – Foundation