Maths practice for 12-year-olds - page 268 of 359

Number of problems found: 7167

Metal rod
The metal rod measures 1.2 meters. How many decimetres is a quarter of a metal bar smaller than five-sixths of a metal bar?
Cubes
Carol with cut bar 12 cm x 12 cm x 135 cm to the cubes. Find the sum of all the surfaces of the resulting cubes.
Three painters
One painter paints the school in 7 days, the other in 6 days. The school had to be painted in 2 days. A third painter was called in, and they all worked simultaneously. In how many days would this third painter paint the school by himself?
Calculate
Calculate the area of the ABE triangle AB = 38 mm and height E = 42 mm Ps: please try a quick calculation
Map scale
What is the map's scale if 5.4 km is 72 mm on the map?
Wallpaper needed
Calculate how many m² of wallpaper is needed to wallpaper a room with dimensions a = 3 m, b = 4 m, c = 3.5 m
Problems solved
The teacher submitted ten tasks during the competition. Students will receive 5 points for each correctly solved problem; 3 points will be deducted for an incorrect solution. How many math problems did the student solve correctly if he finally got 34 poin
Tricycles and scooters
Honza's kit included 19 wheels. He used them all to construct tricycles and scooters. How many complete scooters and tricycles did he build? He will find all the solutions.
Dalmatian spots
Kamil bought 101 Dalmatians. Of these, 58 had a spot on the left ear, 15 had a black spot on the right ear, and 29 had both ears white. How many Dalmatians have black spots on both ears?
Gasoline
How many liters of gas is in the tank if its weight is 15.4 kg? The specific density of gasoline is 770 kg/m³.
Pizza 4
Marcus ate half a pizza on Monday night. He then ate one-third of the remaining pizza on Tuesday. Which of the following expressions shows how much pizza Marcus ate in total?
Wagon unloading
Workers unload the wagon in 3 1/2 hours. How much will it land in 2 hours?
Rhombus sides
If you decrease the side of the rhombus by 30 mm, its circumference will be 70.8 mm. How long was the side of the original rhombus?
Rhombus
If we increase the rhombus side by 2.4 cm, its perimeter is 20 cm. How long was the side of the rhombus?
Circumference of a rhombus
If you enlarge the side of the diamond by 4 cm, its circumference will be 20 cm. How long was the side of the original diamond?
Square
Calculate the square's perimeter and area with a diagonal length of 30 cm.
Flu cases
There were 36 new cases of influenza at the school during the study week, which was 40 percent less than in the previous week. How many new flu cases have been reported in the last week?
Parallelogram ABCD
Calculate the area and perimeter of the ABCD parallelogram with side a = 2.7 m, height to side a - va = 0.8 m, and b = 1.9 m.
Three-digit code
The five cards with the numbers 1, 2, 3, 4, and 5 put together all three-digit odd numbers. How many are there?
Perimeter to area
Calculate the area of a circle with a perimeter of 15 meters.

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