Math practice for 13 year olds - page 414 of 428
Number of problems found: 8548
- Components
The 7 white, 4 blue, and 3 red components are in the box. What is the probability that we pull one white, one blue, and one red component without returning it? - Gutter
How much metal is needed to produce 60 pieces of gutter pipes with the diameter 17 cm and length of 6 m? The plate bends add 6% of the material. - Store
2.1 EUR discounted one meter of the textile. Now, 10 m of textile costs the same as 8 m. Calculate the old and new prices of 1 m of textile. - Rhombus ABCD
Rhombus ABCD, |AC| = 63 cm, |BD| = 50 cm. Calculate the perimeter of the rhombus ABCD. - Quadrant
In what quadrant is a -1165° angle? - No. of divisors
How many different divisors have number 13 4 * 2 4? - Percentages above 100%
What is 144% of 65? What is the meaning of percentages above 100%? - Excavation
Mr. Vendelín calculated that excavation for a water connection digs for 10 days. His friend would take 10 days. Vendelín worked 3 days alone. Then his friend came to help and started on the other end. On what day since the beginning of the excavation they - Bonus
The gross wage was 1222 EUR, including the 14% bonus. How many EUR were bonuses? - Tare
The gross weight of a shipment is 6278 kg, and its tare is 6.3%. Calculate the net weight of the shipment. - Water
Mix 58 l of water with a temperature of 81 °C, 10 l warm of 54 °C, and 41 l water of 67 °C. What is the temperature of the mixed water immediately after mixing? - Clock's hands
The clock shows 12 hours. After how many minutes will the angle be between the hour and minute hand 60°? Consider the continuous movement of both hands for hours. - Slope
What is the slope of a line with an inclination -325°? - Perpendicular
Find the slope of the line perpendicular to the line p: y = 8x +6. - Cylinders
The area of the side of two cylinders is the same rectangle of 48 cm × 38 cm. Which cylinder has a larger volume, and by how much? - Scale
The swimming pool is long 50 m and 30 m wide. The city's plan is shown as a rectangle with an area 2.4 cm². What scale is the city plan? - IS triangle
Calculate the interior angles of the isosceles triangle with base 12 cm and legs 19 cm long. - Alcohol
How much 56% alcohol do we need to pour into 22 liters 78% alcohol to get p3% alcohol? How much 76% alcohol do we get? - Short cut
Imagine that you are going to a friend. That path has a length of 120 meter. Then turn doprava and go other 630 meters, and you are at a friend's. The question is, how much will the journey be shorter if you go directly across the field? - Rhombus
Internal angles of a rhombus are in ratio 2:5. How many times is the shorter diagonal longer than the side of the rhombus?
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