Addition Of Fractions With Same Denominators Basic 3 Mathematics Lesson Note

A. COUNTING SKILL: NUMBERS 751-770, 401-770, 1-770

Counting from 751 to 770: 751, 752, 753, 754, 755, 756, 757, 758, 759, 760, 761, 762, 763, 764, 765, 766, 767, 768, 769, 770

Counting by 100s from 400-770: 400, 500, 600, 700

Skip counting by 10s from 750-770: 750, 760, 770

Practice counting:

• From 755 to 765: _______
• From 762 to 770: _______
• Backwards from 770 to 760: _______

Fill in missing numbers:

• 756, 757, _____, 759, _____
• 765, _____, 767, _____, 769
• _____, 752, _____, 754, _____

B. WRITING SKILL: WRITING OF THE NUMBERS

Write in words:

• 751 = Seven hundred and fifty-one
• 755 = Seven hundred and fifty-five
• 760 = Seven hundred and sixty
• 765 = Seven hundred and sixty-five
• 770 = Seven hundred and seventy

Write in figures:

• Seven hundred and fifty-three = _______
• Seven hundred and fifty-eight = _______
• Seven hundred and sixty-two = _______
• Seven hundred and sixty-seven = _______
• Seven hundred and sixty-nine = _______

Practice:

• 754 = _______
• 761 = _______
• Seven hundred and fifty-six = _______
• Seven hundred and sixty-eight = _______

C. ADDITION OF FRACTIONS WITH SAME DENOMINATORS

Rule: When adding fractions with the same denominator, add the numerators and keep the same denominator.

Examples:

• 1/4 + 2/4 = ¾

• 2/6 + 1/6 = 3/6

Y

• 1/8 + 2/8 = 3/8

Step by step: 2/7 + 3/7

• Same denominator: 7
• Add numerators: 2 + 3 = 5
• Answer: 5/7

Practice addition:

1. 1/3 + 1/3 = _____
2. 2/5 + 2/5 = _____
3. 1/6 + 4/6 = _____
4. 3/8 + 2/8 = _____
5. 1/7 + 5/7 = _____

D. SUBTRACTION OF FRACTIONS WITH SAME DENOMINATORS

Rule: When subtracting fractions with the same denominator, subtract the numerators and keep the same denominator.

Examples:

• 3/4 – 1/4 = 2/4
• 4/5 – 2/5 = 2/5
• 5/6 – 3/6 = 2/6
• 7/8 – 3/8 = 4/8

Step by step: 5/7 – 2/7

• Same denominator: 7
• Subtract numerators: 5 – 2 = 3
• Answer: 3/7

Practice subtraction:

1. 3/4 – 1/4 = _____
2. 4/5 – 1/5 = _____
3. 5/6 – 2/6 = _____
4. 6/8 – 2/8 = _____
5. 7/9 – 3/9 = _____

E. QUANTITATIVE REASONING

Word problems:

1. Kemi ate 2/8 of a pizza and Tolu ate 3/8 of the same pizza. What fraction did they eat together?
2. A cake was divided into 7 equal parts. If 5/7 was served and 2/7 was eaten later, how much cake was consumed in total?
3. Ada had 6/9 of her homework done. She completed 2/9 more. What fraction of homework has she finished?
4. A farmer used 4/10 of his land for corn and 3/10 for beans. What fraction of land did he use altogether?

Mixed operations:

1. 2/5 + 1/5 – 1/5 = _____
2. 4/6 – 1/6 + 2/6 = _____
3. 3/8 + 2/8 – 1/8 = _____

Fraction comparison: Circle the bigger result:

1. (2/5 + 1/5) or (4/5 – 1/5)
2. (3/6 + 2/6) or (6/6 – 1/6)

Pattern completion:

1. 1/4, 2/4, 3/4, _____
2. 6/7, 5/7, 4/7, _____
3. 1/5 + 1/5 = 2/5, 2/5 + 1/5 = _____, 3/5 + 1/5 = _____

CLASS EXERCISES

1. Count from 758 to 768:
2. Write in words:
   1. 757 = _______
   2. 764 = _______
   3. 770 = _______
3. Write in figures:
   1. Seven hundred and fifty-nine = _______
   2. Seven hundred and sixty-six = _______
4. Add these fractions:
   1. 1/4 + 2/4 = _____
   2. 2/6 + 3/6 = _____
   3. 1/8 + 4/8 = _____
5. Subtract these fractions:
   1. 5/7 – 2/7 = _____
   2. 4/5 – 1/5 = _____
   3. 6/9 – 4/9 = _____
6. Word problems:
   1. Bola ate 1/6 of a cake. Ade ate 3/6 of the same cake. How much cake did they eat together?
   2. A garden had 7/10 flowers blooming. If 2/10 more flowers bloomed, what fraction of flowers are now blooming?
7. Complete the patterns:
   1. 1/3, 2/3, _____, _____
   2. 8/9, 7/9, 6/9, _____, _____
8. Mixed operations:
   1. 3/5 + 1/5 – 2/5 = _____
   2. 4/7 – 1/7 + 2/7 = _____
9. Circle the correct answer:
   1. 2/4 + 1/4 = (3/4, 3/8, 2/5)
   2. 5/6 – 2/6 = (3/6, 7/6, 3/12)
10. Problem solving: A pizza is cut into 8 equal slices. If 3/8 is eaten for lunch and 2/8 for dinner, what fraction is left?