Maths practice for 14 year olds - page 288 of 371
Number of problems found: 7408
- Z9-I-4
Kate thought of a five-digit integer. She wrote the sum of this number and its half in the first line of the workbook. Write a total of this number and its fifth on the second line. She wrote a sum of this number and its one nines on the third row. Finall
- Tunnels
Mice had built an underground house consisting of chambers and tunnels: • each tunnel leading from the chamber to the chamber (none is blind) • from each chamber lead just three tunnels into three distinct chambers, • from each chamber, mice can get to an
- Unknown 3922
16% of the unknown number equals the square root of the number 25. Find this unknown number.
- Circumference 3919
Determine the diagonal of a square whose circumference is equal to 72 cm.
- Average speed
What is the average speed you have to move around the world in 80 days? (Path along the equator, round to km/h).
- Dictation
A total of 30 students wrote the dictation. One third of them got a one or a four. Four times more twos than threes. How many students have an insufficient grade, if we know that 7 students got a first grade, which is also the same number as the sum of th
- Area and percents
Find what percentage is a smaller cube surface when the wall's surface area decreases by 25%.
- Four-digit 3912
Create all four-digit numbers from digits 1,2,3,4,5, which can repeat. How many are there?
- Cuboid enlargement
By how many percent increases the volume of the cuboid if every dimension increases by 30%?
- Pet store
They sold fish from one aquarium from the breeding product (Zverimex). Ondrej wanted half of all the fish, but to avoid cutting any fish, he got half the fish more than he wanted. Matej wanted half of the remaining fish, but like Ondrej, he got half the f
- Three friends
Three friends divided the profit by 104,650 CZK so that for every 4 CZK, which got the first friend, equals five crowns for the second, and for every 9 CZK, which got the second, equals 16 CZK for the third. Question: Who got the most and how much?
- Unknown number 7
16% of the unknown number is 21 less than the unknown number itself. Determine the unknown natural number.
- Three children
Three children eat eight chocolates in 6 days. How many chocolates do six children eat in 18 days?
- Percentage 3892
The bar contains 81g of coconut per 200g. What percentage of coconut does the bar have?
- Probability 3891
Michal chose blue, white, red, orange, black, and brown shorts. What is the probability that he will select blue shorts?
- Sum of members
What is the sum of the first two members of the arithmetic progression if d = -4.3 and a3 = 7.5?
- Expression 3887
Determine what z equals in the expression 169^z = 2 · 6.5
- Chocolate 3886
Chocolate has 86% cocoa. Determine how many grams of cocoa are in 165-gram chocolate.
- Equation: 3881
What is the solution of the equation: 2^x = 2/64
- Difference 3878
Determine the difference between members of AP and find the third term: 7; 3.6;...
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