Math practice for 13 year olds - page 94 of 413
Number of problems found: 8253
- Five-digit number digits
Determine the number of all-natural five-digit numbers in decimal notation that each have the digits 0, 1, 3, 4, 7. - Boy tablet dosage
Joey is sick and has to take 1 tablet three times a day. How many days will a pack of 30 tablets last him if he only takes 1 tablet in the morning and evening every third day? - Andrew 2
Andrew and Chloe went shopping. Andrew spent $10 less than Chloe. If we let y represent how much Chloe spent, write an algebraic expression for how much Andrew spent - Wayne
Wayne can clear a plot of land in 1/3 hours, and Melvin can clear the same plot of land in 2/4 hours. What could possibly be the time for both Wayne and Melvin if they combine to clear the same plot of land? - Reconstruction The school decided to carry out a renovation and began by replacing the doors. After installing the doors, the principal decided to number each door. As soon as he had this idea, he had the mathematicians calculate how many individual digits were needed i
- Fraction equality solving
Fill in the place of x with such a number that the equality applies. 5/6=15/x How can this be calculated? - Square point distance
I was given a square ABCD 4.2 cm. Find the set of all points that have a distance less than or equal to 2 cm from one of its vertices and lie inside this square. Indicate how much of the square this area occupies as a percentage. - Simultaneous start
A pedestrian and a cyclist set off simultaneously from two villages 24 km apart. The pedestrian walked at an average speed of 4 km/h and met the cyclist after ninety minutes of walking. What was the average speed of the cyclist? - Felix
Calculate how much land Felix Baumgartner saw after jumping from 36 km above the ground. The radius of the Earth is R = 6378 km. - Five-digit number divisibility How many different five-digit numbers with different digits can be made from the digits 0, 2, 4, 6, 7, 8, and 9? How many of them are divisible by 4? How many of them are divisible by 10? How many of them are even?
- Five-digit number count Determine the number of all natural numbers greater than 2000 in which the digits 1, 2, 4, 6, and 8 occur at most once each.
- Picture square cover
Pupils had to stack rectangle-shaped pictures with dimensions of 210 mm and 84 mm so as to cover the square. What is the smallest square we can cover like this, and how many images do we need? - Reduce ratio
Express the following ratio in simplest form: 30:42 - Two brothers 4
Peter is 24 years, and his brother Tom is 6 years. For how long will Peter be three times as Tom? - Natural numbers Find the number of all natural numbers greater than 200 in which the digits 1, 2, 4, 6, 8 occur at most once and not contains any other digits.
- RT area
A right triangle has an area of 54 cm². Calculate the sizes of both legs if the shorter leg is 75% of the size of the longer leg. - Isosceles ditch
A ditch with a cross-section in the shape of an isosceles trapezoid with bases of 3 m and 5 m and arms of length 2 m is 2.5 meters deep and 10 meters long. How many cubic meters of soil did they have to excavate when digging it? - A chemist
A chemist recorded the change in temperature of a cooling liquid as −25.5° over a 1.5-minute period. The temperature fell at a constant rate. What was the rate of change in temperature? Enter your answer in the box. °F per minute - Triangle side ratio I have a right triangle, the length of the hypotenuse is c 20, and I only know the side ratio a:b = 2:1. I can't figure out the actual length of the hangers = I'm already an old man, and my brain doesn't work at 100% like it did years ago at school - I co
- Mug handle triangle Mug's handle is in the shape of a right-angled triangle with a hypotenuse of 15.8 cm and a shorter overhang of 5 cm. How tall is a mug?
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