Prealgebra

Featured Answers

Intro to Prealgebra

• What is prealgebra?
• Algebra vs. Prealgebra

Negative Numbers and Absolute Value

• Negative Numbers
• Absolute Value

Factors and Multiples

• Divisibility and Factors
• Prime Numbers
• Prime Factorization
• Least Common Multiple
• Greatest Common Factor

Decimals

• Decimals and Place Notation
• Using Decimals in Math
• Decimals on a Number Line

Fractions

• Understanding Fractions
• Equivalent Fractions and Simplifying
• Comparing Fractions
• Decomposing Fractions
• Fractions with Different Denominators

Ratios, Proportions, Units and Rates

• Ratios and Proportions
• Rates
• Unit Conversions
• Metric System Unit Conversion

Exponents, Radicals and Scientific Notation

• Exponents
• Square Root
• Cube Root
• Scientific Notation

Arithmetic and Completing Problems

• Place Value
• Rounding Whole Numbers
• Rational and Irrational Numbers
• Order of Operations

Uncategorized Questions

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• Tom can clean the store in twelve hours. If Sandy helps, it takes them ten hours. Without help, how long would it take Sandy to do the same thing?
• Alyssa and Benny were able to dig a garden in 2 hours together. It takes Benny 5 hours to finish this job alone. Without help, how long would it take Alyssa to finish this job?
• The temperature in Spearfish, South Dakota, fell from 54°F to -4°F at 9:27 AM. How many degrees did the temperature fall?
• 999mg is equal to how many grams?
• 75% of what number is 187.5?
• What is the GCF of 225 and 315?
• What is (8*6) / (3 + 9)?
• A man charges $65 for a chair at a craft market. The materials for a chair cost $45 and there is a $75 fee for a booth at the market. How many chairs must he sell to make a profit?
• What is (1/5) of 30?
• What is (1/14 * 28)?
• Karen raked 3/5 of the yard. Minni raked 1/3 of the amount Karen raked. How much of the yard did Minni rake?
• 2,500 g is equal to how many kilograms?
• What is 5#1/4# #*# 2#2/3#?
• What is #-15/12* -0.12#?
• What is #-8/3 + (-11/9)#?
• If seven LEGO sets are sold each second, how many LEGO sets are sold in three hours?
• 4#1/3# cans of water must be added to a can of lemonade concentrate to make 64 ounces of lemonade. How many cans of water are needed to make 96 ounces of lemonade?
• A shirt was originally priced at $70. The store is having a 15% off sale. What is the new price of the shirt?
• Ray is shopping for a new TV. Music Hut is advertising a sale on TVs for 75% of their original price and Ray has a coupon for an additional 10% discount. If the TV he wants to buy has an original price of $600, how much will Ray pay before tax?
• What is #2^2 - 4^1 + 2^3#?
• What is #1.52 * 10^6#mm converted to km?
• What is .00110 cm converted to mm?
• What is 5.5 — 8.1?
• What is 12.48 + (-10.636)?
• What is the least common multiple of 14 and 21?
• For a school bake sale, students sold 312 cupcakes. They earned $670.80 from selling cupcakes. What was the cost of each cupcake?
• 7 is 28% of what number?
• Is 7.1 a real number?
• Why does #|x| < 0# have no solution?
• 75 is what percent of 130.2?
• What is #43 * 5#?
• What is the value of #-10 - (-10)#?
• What is #4 * 0 * 5#?
• What is the average of #-2.5 , 5.2 , 1.7# and #-0.8#?
• What is #7.69-(-2.5)*(-4)#?
• If the weight of a package is multiplied by #5/7# the result is 40.5 pounds. What is the weight of the package?
• If you can buy four bulbs of elephant garlic for $8, then how many can you buy with $32?
• How do you round 86,492 to the nearest ten thousand?
• Ian's mother drivers 8#1/5# miles to work each day. His father drives 9#1/2# miles round-trip between home and work. How much farther is Ian's mother's round-trip than his father's?
• What is 5#1/2# - 4#7/8#?
• An adult blinks about 450 times in 30 minutes. A 12 year old blinks about 150 times in 15 minutes. How many more times does an adult blink in minutes than a 12-year-old?
• What is 3#7/8# #+# (#-# 4#5/8#)?
• What is 3#1/2# / 2#3/8#?
• What is #41 * 8.065#?
• What is the percent increase from 35 to 56?
• Beryl made 5 gallons of lemonade for a family gathering. About how many cups of lemonade did Beryl make?
• What is #(2.21 * 10^7) / (3.4 * 10^4)#?
• What is #89 * 126#?
• What is 32.2 kg in grams?
• What is 2864.2 g in kilograms?
• There are 34 chickens and 14 horses on the farm. How do you write a ratio of horses to chickens in the simplest form?
• 150 is 15% of what number?
• 36 plus a number equals 59. What is the number?
• Davis had $295 in his bank account. He then made a deposit of $490. What is the account balance?
• On day 1, a volcano expelled five metric tons of sulfur dioxide. On day 2, the same volcano expelled 12 metric tons of sulfur dioxide. What is the percentage increase in sulfur dioxide from day 1 to day 2?
• I am thinking of a number. When I double my number and then subtract the result from five, I get negative one. What is my number?
• What is #305 - 153#?
• Karla has 19 muffins. She gave 3 muffins to Pallavi. How much does she have left?
• Jeremy ran a mile in 5 minutes and 8 seconds. What was the time in minutes as a decimal?
• Mike got on an elevator and went down 3 floors. He meant to go to a lower level, so he stayed on the elevator and went down 3 more floors. How many floors did Mike go down altogether?
• The temperature dropped 2 °F every hour for 6 hours. What was the total number of degrees the temperature changed in the 6 hours?
• A shirt that normally sells for $32.00 before discount was priced at $26.95 after discount. What is the percent saved?
• What is 1#1/2 * 2# / 1#1/3#?
• What is 2 liters in milileters?
• What is #4/8+10/12#?
• How do you write a verbal expression for the algebraic expression #8*(5-3)#?
• What is the next number in the pattern: 4, 9, 16, 25?
• The candy store is having a 30% off sale. Emma is going to buy $7.50 worth of candy. How much will she pay after the discount?
• Tara walks 2 miles each day. How many miles does she walk in 7 days?
• How do you write the answer to #13/3 + 17/5# as a mixed number?
• What number comes next in the sequence: 776, 676, 576, 476?
• What is #(-2.5) + (-2.5)#?
• What is #-0.4+8.25 * 0.1#?
• Jimmy’s new cell phone cost him $49.99 when he signed a 2-year plan, which was 75% off the original price. What was the original price?
• Anita got 4 problems wrong on a test of 36 questions. What percent of the questions did she get correct?
• How do you simplify #4(1/2 + 3/4)+(- 2)#?
• Jim is running on a trail that is #5/4# of a mile long. So far he has run #2/3# of the trail. How any miles has he run so far?
• Jon is making hamburgers for lunch. He has 42#2/3# lbs of ground beef. How many #1/3# pound hamburgers can he make using all the ground beef?
• Jill buys 4 tickets to a concert. Each ticket costs $15.80. How much do all the tickets cost in total?
• What is 3#7/10# + 3#7/10#?
• Three girls share 8 yards of fabric equally. How many yards of fabric does each girl get?
• Tickets to the county fair are $8 for an adult and $5 for a child. If you have a 15% discount card, how much will 2 adult tickets and 2 child tickets cost?
• What is #m * n# when #m=13# and #n=12#?
• What is 74% of 56?
• 18 is what percent of 72?
• At 11:00 AM, the temperature is 17°F. If the temperature drops 3°F per hour, what will the temperature be at 2:00 PM?
• What is the ratio #2/3# to #8# as a fraction written in simplest form?
• What is 10#2/7# + 20 #1/7#?
• Trystan just ate at a deli. He really enjoyed his meal and service, so he wanted to leave a 20% tip for his waiter. His bill before tip was $24.12. What was the total for his bill?
• 14 is what percent of 100?
• 50 is what percent of 200?
• 10 is what percent of 80?
• You have been saving pennies in a jar, and you now have 123 pennies. You want to know the total mass of the pennies before you take them to the bank. If each penny has a mass of 2.50 g, what is the total mass of the pennies?
• Jamar writes #5 - (-6) * 4+(-3) = 41#. Elena says the result should be 26. Who is correct and why?
• A certain tree bears 73 individual pieces of fruit each year. Suppose you own an orchard that contains 120 of these trees. How much fruit will the orchard produce each year?
• The price of a bike was $600. If a store is offering a 20% discount, what is the sale price of the bike?
• While fishing Carol caught two fish and her sister caught seventeen fish. How many fewer fish did Carol catch than her sister?
• Tyrese purchased a container of juice that contains 220 calories. The label says that 60% of the calories are from carbohydrates. How many calories are not from carbohydrates?
• How do you express .13 as a percentage?
• A dog’s tail is 2 inches long. Every year his tail grows by 5%. What will be his tail's length next year?
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