Question
If a = 0.121212… (repeating) and b = √5, state
whether each is rational or irrational.Solution
a = 0.121212… is a repeating decimal ⇒ it can be expressed as a fraction ⇒ rational number. b = √5 cannot be expressed as a ratio of two integers ⇒ irrational number. Answer: a is rational, b is irrational.
- Find the simplified value of the given expression.

(24% of 500 - 20) ÷ 25 = ? ÷ 4
- What will be come in place of (?) in the given expressions.
45% of 640 + 35% of 320 = ? What will come in the place of question mark (?) in the given expression?
35 X 72 + 35 X 28 = ? X √16Â
1365 ÷ 15 + (? ÷ 5) = 62 × 3.5
375% of 320 - 80% of 40 ÷ √256 = ?
What will come in the place of question mark (?) in the given expression?
√(? - 212) - 84 = 81 - 13 X 9
[(40)2 ÷ 32 × 4] ÷ 50 = ?
What will come in the place of question mark (?) in the given expression?
(50 × 6 ÷ 12) × 9 = ?
24% of 150% of 500 + 140 = ? × 8Â