Maths practice for 12-year-olds - page 77 of 349

Number of problems found: 6967

Marksman 78334
The igniter cord used in normal quarry blasting burns at a rate of 8 mm/s, the length usually used is 60 cm. At what minimum speed must the marksman move to a shelter 150 m away?
A book 3
A book that is printed on both sides has 36 pages. If the book is 3/8 cm thick, determine the thickness of one page in cm.
Fabric 78284
How many m³ of fabric do we need to buy to make 20 cubes with an edge of 4.5 dm?
Competitor 78234
The first competitor completed the track in 2h12min11s. How much worse was the other's time of 2h19min3s?
Your chocolate
Your chocolate chip cookie recipe makes three dozen cookies, but you need four dozen cookies. If the recipe requires 1 7/8 cups of vegetable oil, 2 1/2 teaspoons of almond extract, and 3 1/2 cups of oatmeal, how many ingredients are necessary for four doz
A parking
A parking garage has five levels below ground. Each level is the same height. Consider ground level to be 0. The depth of the fifth level of the parking garage is -118.5 ft. What is the depth of the first level of the parking garage?
Franco, Elliot
Franco and Elliot are on their school's swim team. Last week, Franco swam 5 7/10 miles. Elliot swam 1 1/3 times as far as Franco. How far did Elliot swim?
Swimming 78124
A 16 m square swimming pool has an area of 1 m² on the city plan. What is the scale of the city plan?
The mother
The mother bought 3 3/4 kg of beef, 2 1/4 of pork, and 5 1/4 of chicken. How many kilograms of meat did she buy?
Fenced 78064
I bought 51m of wire, fenced off a square garden, and had 3m of wire left. What is the size of the garden?
Anthea
Anthea is running an experiment to examine vaccine shelf life, and she must precisely monitor the temperature. The starting temperature is −116 degrees Celsius (°C). The temperature rises by 35 degrees, then falls by 12 a degree. What is the final tempera
O'clock 78004
What is the degree angle made by the hands of a clock when it points to 8 o'clock?
Cube-shaped 77974
How much shelf space does a cube-shaped aquarium take up if it holds 27 liters of water?
Drill bit
Bill's 3/8-inch drill bit is missing and needed for a job. He can get by with drilling a smaller hole than 3/8-inch as long as it is as close to 3/8-inch as possible. Which of the following bits would be the best to use? A. 13/32 inch B. 23/64 inch C. 1/2
Madeline
Madeline is making a quilt. She found some pieces of fabric on sale, each measuring 9/10 of a yard. She will use 2 1/2 of the pieces for the quilt. What is the total length of the fabric she will use?
Manuel
Manuel has a rope that is 4 meters long. He cuts away a piece that is 1.06 meters long. How long is the remaining piece of rope?
Three friends
You and your friends are playing basketball. You make 7 out of 15 shots. Your first friend makes 6 out of 10 shots, and your second friend makes 5 out of 12 shots. Who is the better shooter (write a, b, c)? How would you solve the problem using what you k
Half of the product
What is half the product of 8 1/7 and 7 4/5?
Convert 5
Convert to a mixed number and simplify: 83/6
Scientific experiment
In a scientific experiment, the temperature of a liquid was -12 degrees. If the temperature was increased by 5 degrees, what would the temperature be then?

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