Primary Three Second Term Mathematics Lesson Note

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PRY 3 SECOND TERM MATHS LESSON NOTE

WEEK 1

Addition and Subtraction of Fraction with the Same Denominator

Add and Subtract Like Fractions.

Like Fractions are fractions with the same denominator.

Example 1: Pablo spent ³/₅ of an hour on a jigsaw puzzle. Conrad spent ¹/₅ of an hour on the puzzle. How much time did they spend working on the puzzle in all?

You need to add ³/₅  and ¹/₅.

Note this: To add fractions with the same denominators, add the numerators and keep the same denominator.

³/₅  + ¹/₅

Add and Subtract Mixed Numbers.

Example 3: Tim is painting a backdrop for the school play. He mixed 2²/₄ gallons of blue paint and 1¹/₄ gallons of red paint to make dark purple. How many gallons of dark purple paint did Tim make?

Add.  2²/₄  +  1¹/₄

(2 + 1) ²/₄  +  ¹/₄       =    3³/₄

So, Tim made 3³/₄ gallons of dark purple paint.

Subtracting mixed numbers with like denominators is similar to adding mixed numbers.

Add and Subtract, Unlike Fractions.

Example 4: Find ¹/₂  +  ¹/₄

Step 1: Check the denominators (Since they are different)

Step 2: Check if the denominators can divide each other. If they can; pick the greater number but if they cannot; multiply them.

Step 3: Continue with the working as outlined in the previous topic.

¹/₂  +  ¹/₄

2  +  1   /4    =     3/4

Example 5:  Find ¹/₂  –  ²/₅

Since the denominator are different are different, and they cannot divide each other completely, then multiply them.

¹/₂  –  ²/₅

5  –  4   /10      =    1/10

 Quiz

1. Sanchez spent ³/₅of an hour on a jigsaw puzzle. Conrad spent ¹/₅ of an hour on the puzzle. How much time did they spend working on the puzzle in all?
2. Morris jogged ⁵/₈of a mile on Monday and ³/₈ of a mile on Tuesday. How much farther did she jog on Monday?

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