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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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