All HiSET: Math Resources
Example Questions
Example Question #1 :Numbers And Operations On Numbers
How many significant digits does the number 205,000 have?
Six
Three
Two
Four
Five
Three
The number of significant digits that an integer has is equal to the number of digits from its first nonzero digit to its last nonzero digit, inclusive. As seen below in boldface, this is a group of three digits:
205,000
Three is the correct response.
Example Question #1 :Numbers And Operations On Numbers
How many significant digits does the number 0.03040 have?
Three
Two
Six
Four
Five
Four
In a decimal expression, any leading zeroes of a decimal expression must be discounted as significant digits; all digits from the first nonzero digit onward must be counted. These digits are in boldface below:
0.03040
Four is the correct response.
Example Question #2 :Precision
How many significant digits does the number 60.000007 have?
Six
Four
One
Two
Eight
Eight
To find the number of significant digits of a decimal expression with digits on both sides of the decimal point, count the digits from the first (nonzero) digit to the last digit. 60.000007 has eight digits, all of which are significant.
Example Question #1 :Numbers And Operations On Numbers
How many significant digits does the number 0.080808080 have?
Ten
Nine
Eight
Four
Five
Eight
In a decimal expression, any leading zeroes of a decimal expression must be discounted as significant digits; all digits from the first nonzero digit onward must be counted. These digits are in boldface below:
0.080808080
The figure has eight significant digits.
Example Question #5 :Precision
Multiply, adjusting forsignificant digits.
First, determine the number of significant digits in each factor. Since each factor includes only nonzero digits, the number of significant digits in each is simply equal to the number of digits. Thus,7.21and2.713have three and four significant figures, respectively.
现在,直接用数字。The product is
The product must be rounded to the appropriate number of significant digits. This number must be the lesser of the numbers of significant digits that appear in the factors, which is three. Count from the first nonzero digit:
Rounded, this is 19.6, the correct response.
Example Question #6 :Precision
Multiply, adjusting forsignificant digits.
First, determine the number of significant digits in each factor. Each factor has one or more leading zeroes, and each has its final digit after the decimal point, so in each case, the number of significant digits is equal to the number of digits from the first nonzero digit to the last digit. 0.0456and 0.53have three and two significant digits, respectively.
现在,直接用数字。The product is
The product must be rounded to the appropriate number of significant digits. This number must be the lesser of the numbers of significant digits that appears in the factors, which is two. Count from the first nonzero digit:
Rounded, this is 0.24, the correct response.
Example Question #1 :Hi Set: High School Equivalency Test: Math
Multiply, adjusting forsignificant digits.
First, determine the number of significant digits in each factor. Both factors have leading zeroes, which must be discounted. Therefore, in each factor, the number of significant digits can be found by counting from the first nonzero digit to the final digit. 0.00421and 0.00332each have three significant digits.
现在,直接用数字。这个产品,我gnoring any trailing zeroes, is
The product must be rounded to the appropriate number of significant digits. This number must be the lesser of the numbers of significant digits that appears in the factors, which is three. Count from the first nonzero digit:
Rounded, this is 0.0000140, the correct choice. (Note that this trailing zero must be kept in order to have three significant digits.)
Example Question #1 :Numbers And Operations On Numbers
Add, adjusting forsignificant digits:
When adding numbers, accounting for significant digits, the sum must be rounded to the same place as the least precise of the numbers. 9.7000and 4.81have their final digits in the ten-thousandths and hundredths place, respectively; this makes 4.81 the less precise measurement, and the sum must be rounded to the nearest hundredth.
Now, add the numbers outright:
To the nearest hundredth, this is rounded down to 14.58, the correct response.
Example Question #1 :Numbers And Operations On Numbers
Subtract, adjusting forsignificant digits:
When subtracting numbers, accounting for significant digits, the difference must be rounded to the same place as the least precise of the numbers. 17.3and 13.452have their final digits in the tenths and thousandths place, respectively; this makes 17.3 the less precise measurement, and the difference must be rounded to the nearest tenth.
Now, subtract the numbers outright, and round to the nearest tenth.
To the nearest tenth, this is rounded down to 3.8, the correct response.
Example Question #1 :Hi Set: High School Equivalency Test: Math
Multiply, adjusting forsignificant digits.
First, determine the number of significant digits in each factor. Both factors have leading zeroes, which must be discounted, and trailing zeroes after the decimal point, which must be counted; therefore, in each factor, the number of significant digits can be found by counting from the first nonzero digit to the final digit. 0.660and 0.5550have three and four significant digits, respectively.
现在,直接用数字。这个产品,我gnoring any trailing zeroes, is
The product must be rounded to the appropriate number of significant digits. This number must be the lesser of the numbers of significant digits that appear in the factors, which is three. Count from the first nonzero digit:
Rounded, this is 0.366, the correct choice.
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