- A
- B
- C
- D
Step-by-Step Solution
9 of the 12 equal parts are shaded, and going down is negative: . HCF of 9 and 12 is 3, so the standard form is .
Answer: D)
A diver went down by the shaded part of 1 km. Going down is written as a negative rational number. What is this number in standard form?
Class 7Rational NumbersRational Numbers
Key idea: Recognising rationals
If you can write a number as **integer over non-zero integer**, it is rational. So:
- All integers are rational: 5 = 5/1, 0 = 0/1, −9 = −9/1.
- All fractions with integer numerator and denominator are rational: 3/4, −2/7, 11/3.
- Any decimal that terminates or repeats is rational: 0.25 = 1/4, 0.333… = 1/3.
Numbers that cannot be written as p/q (like √2 or π) are NOT rational — they're irrational. You'll meet those in Class 9.
- All integers are rational: 5 = 5/1, 0 = 0/1, −9 = −9/1.
- All fractions with integer numerator and denominator are rational: 3/4, −2/7, 11/3.
- Any decimal that terminates or repeats is rational: 0.25 = 1/4, 0.333… = 1/3.
Numbers that cannot be written as p/q (like √2 or π) are NOT rational — they're irrational. You'll meet those in Class 9.
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More Class 7 Rational Numbers practice
Strips A and B are the same length, and their shading shows -3/5 = -9/15 (shaded =…Points A and B are marked on the number line. Each unit is cut into equal parts. How far…Arrange the rational numbers on the four cards in ascending order (smallest first).Find a rational number between 1/4 and 1/2.Order from smallest to largest: -2/3, 1/2, -3/4, 0. Which option lists them correctly?