- A-12
- B-11
- C-24
- D-13
Step-by-Step Solution
To get 21 from 7, multiply by 3. So multiply the numerator too: −. Thus .
Answer: A) -12
Fill in the missing numerator: = ?/21.
Class 7Rational NumbersRational Numbers
Key idea: Rationals on the number line
Every rational number has a place on the number line. Negative rationals on the left of 0, positive on the right. Between any two rationals, you can always find another rational (in fact, infinitely many) — this is called **density**.
Example: between 1/3 and 1/2, the average (1/3 + 1/2)/2 = 5/12 sits in the middle. Between 1/3 and 5/12 there's another rational, and so on, forever.
Example: between 1/3 and 1/2, the average (1/3 + 1/2)/2 = 5/12 sits in the middle. Between 1/3 and 5/12 there's another rational, and so on, forever.
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