Mental Maths Class 5 Fractions and Decimals

Asked by AKSHAY GURU VARADHARAJAN · SRI CHAITANYA TECHNO SCHOOL, JAYANTI NAGAR.

In a sequence of numbers, each number is 0.25 more than the previous one. If the 3rd number in the sequence is 1.5, what is the sum of the 1st and 5th numbers?

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A 2.0
B 3.0
C 3.5
D 2.5

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Answer: B. 3.0

Explanation: The 3rd number is 1.5. Counting back, the 2nd is 1.25 and the 1st is 1.0. Counting forward, the 4th is 1.75 and the 5th is 2.0. Adding the 1st (1.0) and the 5th (2.0) equals 3.0.

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In a sequence of numbers, each number is 0.25 more than the previous one. If the 3rd number in the sequence is 1.5, what is the sum of the 1st and 5th numbers?

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