Maths practice for 12-year-olds - page 314 of 362
Number of problems found: 7223
- One-thirds 2485
Three classmates bought apples. Peter bought two whole one-thirds of the kg, Spring 5 sixths of a kg less than Peter and Daniel 2 times as much as Peter. How many kilograms of apples did the boys buy together? - One-quarter 2484
Mom baked a bowl of cookies. The son took two-fifths of the cookies and the daughter one-quarter of the rest. What part was left to the parents? - Similarity of squares
The ratio of the similarity of the squares ABCD and KLMN is 2.5. Square KLMN area is greater than an area of a square ABCD with side a: ... - Mr. Zucchini
Mr. Zucchini had a rectangular garden whose perimeter was 28 meters. The garden's area is filled with just four square beds, whose dimensions in meters are expressed in whole numbers. Determine what size could have a garden. Find all the possibilities and - Cyclist vs boat
The cyclist wants to ride a short distance by boat, but when he stops at the pier, the boat does not pick up passengers yet and is preparing to leave. The cyclist decides that the ship will catch up at the next stop. The stop is 12km far along the water a - Truck and car
At 6h45min, the truck started at a speed of 36 km/h. At 7h30m behind it, a passenger car. Find the passenger car's average speed to catch the truck 72 km away from the factory. - Electronics 2476
The electronics store offers a TV with a diagonal screen of 33 inches; the screen's height (without borders) is 44 cm. How wide is the TV if the edge on each side of the screen is 1.1 cm?
- Distance 2469
How many seconds will the car cover a distance of 50 meters at a speed of 100 km/h? - Sprinter
Sprinter runs the relay 4 x 400 m to the handover at a 42 km/h speed. A second runner is at the start of the handover area 20 m long and runs when it is the first sprinter at a distance of 10 m. Calculate the speed at which the second runner must run to t - Students 2462
There are five girls and five more boys in the class. How many students are in the class? - Children 2461
On the slope were k=60 skiers. How many adults are on the hill if children are skiing 15? - Decide
The rectangle is divided into seven fields. In each box, write just one of the numbers 1, 2, or 3. Mirek argues that it can be done so that the sum of the two numbers written next to each other is always different. Zuzana (Susan) instead argues that it is - Isosceles trapezoid
Calculate the circumference and area of the isosceles trapezoid if you know the bases' sizes are 8 and 12 cm and the arms' sizes are 5 cm. - Water in body
Water in the human organism of all the compounds represented constitutes about 3/5 of the total weight. How many kilograms of water is in your body when you weigh 51 kg? - Determine 2450
Peter and George received a total of 200 euros. George received 75% of the amount. Determine how much each of them received.
- Saving
The boy has saved 50 coins, € 5, and € 2. He saved € 190. How many were € 5, and how many were € 2? - Minutes 2446
The water tank is filled with the first inflow in 1 hour 20 minutes, the second in 60 minutes. How many minutes will the tank be half full with both inlets if the other inlet is opened 12 minutes later? - Aircraft nose down
How long will an airliner fall from a height of 10000 m at a speed of 1,000 km/h? - Harvester
The harvester has a cutting width of 4 m, and the harvested grain in the field is 87 meters wide. Harvester moves along the field's length for six minutes; going back (without cutting) takes half the time. Each turn at the end field takes one minute. How - On the farm
On the farm, 70 heads of cattle were housed with a food supply for 180 days. After 60 days, ten heads of cattle were sold, and for the next 30 days, they sold ten more. How many days is a sufficient supply of feed for the remaining cattle?
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