Lesson 11. Highest common factor

EXSAMPLS:

All the factors of 21 are

1,  3,  7,  21

All the factors of 28 are

1,  2,  4,  7,  14,  28

The highest factor in both lists is?

This is called the Highest Common Factor (HCF)

Tasks to the lesson 11

• Test 1
• Test 2
• Test 3

Other lessons:

• Lesson 1. Writing numbers
• Lesson 2. Adding whole numbers
• Lesson 3. Substracting whole numbers
• Lesson 4. Multiplication table
• Lesson 5. Multiplying whole numbers
• Lesson 6. Division whole nambers
• Lesson 7. Exponentiation
• Lesson 8. Sizes and their measuring
• Lesson 9. Dividing whole numbers with remainder
• Lesson 10. Factors and prime numbers
• Lesson 12. Lowest common multiple
• Lesson 13. Equivalent fractions
• Lesson 14. Transformation of fraction
• Lesson 15. Adding fractions
• Lesson 16. Subtract fractions
• Lesson 17. Multiplying fractions
• Lesson 18. Dividing fractions
• Lesson 21. Eventual decimal fractions
• Lesson 22. Adding decimals
• Lesson 23. Subtracting decimals
• Lesson 24. Multiplying decimals
• Lesson 25. Dividing decimals
• Lesson 26. Rounding numbers