Standard Mathematics Primary 4 Fractions

Ravi has two pieces of string. One piece is 3/5 m long and the other is 1/4 m long. What is the total length of the two pieces of string?

A 17/20 m
B 4/9 m
C 2/5 m
D 7/20 m
Show Worked Solution

Worked Solution

Step 1: Find the LCD of 5 and 4. 5 and 4 share no common factors, so LCD = 5 × 4 = 20. Step 2: Convert each fraction to twentieths. 3/5 = (3 × 4)/(5 × 4) = 12/20 1/4 = (1 × 5)/(4 × 5) = 5/20 Step 3: Add the fractions. 12/20 + 5/20 = 17/20 The total length of the two pieces of string is 17/20 m.

Correct answer: 17/20 m

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