Metric Conversions for TEAS 7

Correct Answer: A

Rationale: To convert mg to mcg, you need to multiply by 1000. Therefore, 0.025 mg x 1000 = 25 mcg. The correct answer is A (25 mcg). Choice B (250 mcg) is incorrect as it incorrectly multiplies by 10 instead of 1000. Choice C (2.5 mcg) is incorrect as it drops a zero from the conversion. Choice D (0.25 mcg) is incorrect as it adds an extra zero to the answer.

Correct Answer: B

Rationale: To convert kilograms to grams, you need to multiply by 1000 since 1 kilogram is equal to 1000 grams. So, 0.75 kg * 1000 = 750 grams. Therefore, choice B (750 grams) is correct. Choice A (75 grams) is incorrect as it is a decimal point off; choice C (7,500 grams) is incorrect as it is off by a factor of 10; and choice D (75,000 grams) is incorrect as it is off by a factor of 100.

Correct Answer: A

Rationale: To convert 0.75 to a fraction, we write it as 75/100 and simplify to 3/4 by dividing both numerator and denominator by the greatest common divisor, which is 25. Choice A (3/4) is correct as it represents 0.75 in simplest form. Choices B, C, and D are incorrect because they do not equal 0.75 when converted to a fraction. Choice B (7/10) simplifies to 0.7, choice C (15/20) simplifies to 0.75 but is not in simplest form, and choice D (1/2) simplifies to 0.5.

Correct Answer: B

Rationale: To convert milligrams to grams, you need to divide by 1000 since there are 1000 milligrams in 1 gram. Therefore, 35,400 mg divided by 1000 equals 35.4 grams. Choice B, 35.4 g, is the correct answer as it correctly represents the conversion. Choices A, C, and D are incorrect because they do not perform the correct conversion calculation. Choice A incorrectly moves the decimal point, choice C multiplies instead of divides, and choice D adds an extra zero.

Correct Answer: A

Rationale: The correct answer is A: G. The prefix "giga" represents 10^9 in the International System of Units (SI). The symbol for "giga" is a capital letter G. It is used to denote a factor of one billion. Choice B, m, represents the prefix "milli" which is 10^-3. Choice C, Gg, is not a standard representation of the prefix "giga." Choice D, g, represents the unit of mass "gram," not the prefix "giga." Therefore, the correct notation for the prefix "giga" is A: G.