Multiple choice

The population of country x is 123.6 million and of country y is 89.4 million. What is their combined population? Represent the answer in standard index form.

  1. 2.13 × 106

  2. 2.13 × 107

  3. 2.13 × 108

  4. 2.13 × 109
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Combined population = 123.6 + 89.4 = 213 million = 213,000,000 = 2.13 × 10^8. Add the millions first, then convert to standard form by moving decimal 8 places left.

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