passwella.
Menu

WAEC Mathematics 1999 Question 4

Question 4

Fractions, Decimals and Approximation

Evaluate 3.0 × 101 − 2.8 × 10−1 leaving the answer in standard form.

  1. A.2 × 10−1
  2. B.2 × 102
  3. C.2.972 × 101
  4. D.2.972 × 102
Show the answer and explanation

Answer: C (2.972 × 101)

Explanation

30 − 0.28 = 29.72 = 2.972 × 101.