Fractions – Basic 3 Mathematics Lesson Note (First Term)

A. counting skill: numbers 661-680

Counting from 661 to 680: 661, 662, 663, 664, 665, 666, 667, 668, 669, 670, 671, 672, 673, 674, 675, 676, 677, 678, 679, 680

Practice counting:

• From 665 to 675: _______
• From 672 to 680: _______
• Backwards from 680 to 670: _______

Skip counting by 2s: 662, 664, 666, 668, 670, 672, 674, 676, 678, 680

Fill in missing numbers:

• 666, 667, _____, 669, _____
• 675, _____, 677, _____, 679
• _____, 662, _____, 664, _____

B. writing skill: writing of the numbers

Write in words:

• 661 = Six hundred and sixty-one
• 665 = Six hundred and sixty-five
• 670 = Six hundred and seventy
• 675 = Six hundred and seventy-five
• 680 = Six hundred and eighty

Write in figures:

• Six hundred and sixty-three = _______
• Six hundred and sixty-eight = _______
• Six hundred and seventy-two = _______
• Six hundred and seventy-seven = _______
• Six hundred and seventy-nine = _______

C. fractions

What is a fraction? A fraction shows part of a whole thing.

Parts of a fraction:

• Numerator (top number) = parts we have
• Denominator (bottom number) = total number of parts

Example: 1/2 means 1 part out of 2 equal parts

Common fractions:

• 1/2 = one half
• 1/3 = one third
• 1/4 = one quarter
• 2/3 = two thirds
• 3/4 = three quarters

D. fractions of shapes

Fractions of squares: □ → Half of square = 1/2 ■□ (shaded part = 1/2)

Fractions of rectangles: ▬ → One quarter = 1/4 ■□□□ (shaded part = 1/4)

Fractions of triangles: △ → Half of triangle = 1/2 ■△ (shaded part = 1/2)

Fractions of circles: ○ → One third = 1/3 ●○○ (shaded part = 1/3)

Practice:

1. Shade 1/2 of this rectangle: □□
2. Shade 1/4 of this circle: ○
3. Shade 2/3 of this triangle: △△△

E. fractions of numbers

Finding fractions of numbers:

1/2 of a number: 1/2 of 8 = 8 ÷ 2 = 4

1/3 of a number: 1/3 of 9 = 9 ÷ 3 = 3

1/4 of a number: 1/4 of 12 = 12 ÷ 4 = 3

Practice:

1. 1/2 of 10 = _____
2. 1/3 of 6 = _____
3. 1/4 of 8 = _____
4. 1/2 of 14 = _____
5. 1/3 of 12 = _____

F. quantitative reasoning

Comparing fractions:

• 1/2 is bigger than 1/4
• 1/3 is bigger than 1/4
• 2/3 is bigger than 1/3

Fraction word problems:

1. Tolu ate 1/2 of a pizza. If the pizza had 8 slices, how many slices did he eat?
2. Kemi shared 1/3 of her 12 sweets with her brother. How many sweets did she give him?
3. A farmer sold 1/4 of his 20 chickens. How many chickens did he sell?

Fraction patterns: Complete these patterns:

• 1/4, 2/4, 3/4, _____
• 1/3, 2/3, _____
• 1/2, 2/2, _____

CLASS EXERCISES

1. Count from 668 to 678:
2. Write in words:
   1. 667 = _______
   2. 674 = _______
3. Write in figures:
   1. Six hundred and sixty-nine = _______
   2. Six hundred and seventy-six = _______
4. Write these fractions:
   1. One half = _____
   2. One quarter = _____
   3. Two thirds = _____
5. Shade the fractions:
   1. Shade 1/2 of: □□
   2. Shade 1/3 of: ○○○
   3. Shade 1/4 of: △△△△
6. Find these fractions:
   1. 1/2 of 16 = _____
   2. 1/3 of 15 = _____
   3. 1/4 of 12 = _____
7. Circle the bigger fraction:
   1. 1/2 or 1/4
   2. 1/3 or 1/4
   3. 2/3 or 1/3
8. Word problems:
   1. Ada ate 1/4 of 8 oranges. How many oranges did she eat?
   2. Bolu gave away 1/3 of his 18 marbles. How many marbles did he give away?
9. Complete the fraction: If 3 out of 4 parts are shaded, the fraction is _____
10. True or False:
    1. 1/2 is the same as 2/4: _____
    2. 1/3 is bigger than 1/2: _____