Math practice for 13 year olds - page 117 of 435
Number of problems found: 8682
- Enlarge 66284
We will enlarge the line 8 cm long in the ratio of 7:4. How long in centimeters will the new line be? - Calculate 66254
Calculate the volume and surface of a regular hexagonal prism with a height v = 2cm and a base edge a = 8cm. - Sandwiches
In a cafeteria, 1/6 of the students eat salads, and 2/3 eat sandwiches. There are 18 students in the cafeteria. How many students are eating lunches other than salads or sandwiches? - Substitution 66204
Specify the value of the expression, (3x-5) / (2x + 1) if x equals the value that will be in the reader after substitution. - Flowing 66174
How long in an hour will a 30m, 15m, and 2m pool be filled with water flowing at 900l / min if it is 90% full? - Specific 66124
The numbers are arranged in a specific logical order. Fill in the missing numbers. 5, 8, 16, 15, 18, 36, 35, 38,??, - Mr. Bradshaw
Mr. Bradshaw is leaning a ladder against the side of his house to repair the roof. The top of the ladder reaches the roof, which is 5 meters high. The ladder's base is 1 meter away from the house, where Mr. Bradshaw's son is holding it steady. How long is
- For last
Last week, the temperature varied a total of 17 degrees over the day. If the high for the day was 10 degrees, what was the low for the day (write a number sentence and solve it. ) - Resistance 66074
Determine the current flowing through the car's starter, whose resistance is 60 milliohms at 12V. - Resistances 66064
Two resistors with resistances of 40 ohms and 60 ohms are connected in series and connected to a voltage of 150V. A) the total resistance B) current in the circuit C) voltage on both resistors - Resistance 66054
The handset has a resistance of 4000 ohms. Calculate what voltage is connected to them if the current passes 2.5mA. - Original 66004
They reduced the shoes by CZK 132 to 85% of the original price. How much did they cost before the discount? - Students 65974
In the 9th grade, the ratio of boys to girls is 1:3. There are a total of 24 students in the class. How many boys and how many girls? - Door-to-door 65904
The door-to-door seller of domestic apples sold 40% of the apples in the first household, 20% of the rest in the second, and 24kg in the third. How many kilograms of apples did the seller sell to the first two households together? - Manufacturers 65864
The grocery store has chickpeas in brine from two manufacturers, A and B. On a can from one manufacturer, it says: Solids weigh 240g, weighing 400g. The other manufacturer states: weight solid 245g, weight 410g. Which manufacturer sells canned food with a
- Discount 65854
The TV fell first by 20%, then by 10%. How much did it cost after the second discount if: A) before the first discount cost 450eur? B) after the first discount, cost 450eur? - Percentage 65844
Mr. Josef sold home-grown potatoes at 79 cents per kilogram. When he had the last 5 kg, he told the customer: collect them all for 3 euros! By what percentage did Mr. Josef reduce the potatoes? - Reduction 65814
The Shop first reduced the tablet price by 10% and later reduced the new price by 20%. What was its original price after the tablet cost € 720 to double the reduction? - Calculate cone - S,V
Calculate the surface and volume of a rotating cone, the base of which has a diameter of 6 cm and a height of 4 cm. - Increase 65794
The area of the square is 36 cm². What will be the area of the square if we increase the length of a side by 25%?
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