WorksheetsUnit 1 Review 8th grade math
Total questions: 11
Worksheet time: 33mins
Lucy estimated that it would take 4,000 grains of sand to make a pound. That would mean that each grain of sand weighs 1/4000 of a pound. In decimal form, that weight would be 0.00025 of a pound. Express this in scientific notation?
2.5 × 10–4 pounds
4 × 10–3 pounds
2.5 × 10–3 pounds
2.5 × 10–5 pounds
Which section(s) would the numbers –7, 8, –4 be placed in according to the chart?
Irrational
Integers
Whole
Natural
Robert and Dora need to write 4,300,000,000 using scientific notation. Robert claims that 4,300,000,000 = 4.3 x 108 and Dora claims that 4,300,000,000 = 4.3 x 109. Whose number is correct and why?
Robert’s number is correct because when converting 4,300,000,000, the decimal would be located between the 4 and the 3, and the original decimal point in the standard form moves to the left 8 places.
Robert’s number is correct because when converting 4,300,000,000, the decimal would be located between the 4 and the 3, and the power of 10 is determined by the number of zeros.
Dora’s number is correct because when converting 4,300,000,000, the decimal would be located between the 4 and the 3, and the original decimal point in the standard form moves to the left 9 places.
Dora’s number is correct because when converting 4,300,000,000, the decimal would be located between the 4 and the 3, and the power of 10 is always the number of zeros plus 1.
A researcher measured approximately 0.005123 grams of bacteria in a sample. How is this number expressed in scientific notation?
5.123 × 103 grams
5123 × 10–6 grams
0.5123 × 10–2 grams
5.123 × 10–3 grams
A microscopic cell measures 3.8 × 10–4 centimeters in diameter. What is this number in standard decimal notation?
12,000,000 = 1.2 × 107
–74.308 < –0.74 × 103
2 × 104 < 20,000
5.3 × 10–2 = –0.053
The number 0 is located in which set of numbers?
Rational
Integer
Whole
Natural
List the numbers in order from the day of greatest increase in depth to the day of the greatest decrease in depth.
Tuesday, Thursday, Friday, Monday, Wednesday
Tuesday, Wednesday, Thursday, Friday, Monday
Tuesday, Thursday, Wednesday, Friday, Monday
Thursday, Tuesday, Wednesday, Monday, Friday
Write the following numbers in ascending order.
–2 3/8, –0.85, 4/3 , 1 2/5, –8/6, 0.8
–2 3/8, –8/6, –0.85, 0.8, 4/3 , 1 2/5
–8/6, –0.85, 0.8, 4/3 , 1 2/5, –2 3/8
–2 3/8, 1 2/5, 4/3 , 0.8, –0.85, –8/6
1 2/5, 4/3 , 0.8, –0.85, –8/6, –2 3/8
Which number set represents Section A in the Venn diagram?
Rational
Real
Integers
Irrational
A microscopic cell measures 3.8 x 10-3 centimeters in diameter. What is this number in standard notation?
0.000038
0.00038
0.0038
0.038
List the numbers in order from GREATEST to LEAST?
