The easiest examples
- Three cats
If three cats eat three mice in three minutes, after which time 260 cats eat 260 mice?
Leslie bought 8 same chocolates for 16 Eur. How many euros will he pay for 25 chocolates?
Is the number 761082 exactly divisible by 9? (the result is the integer and/or remainder is zero)
What is better for people (employees)? ?
- One half
One half of ? is: ?
- Brick weight
The brick weighs 2 kg and a half bricks. How much does one brick weigh?
The parents had 7 daughters. Each of them had one brother. How many members family had?
A cyclist passes 88 km in 4 hours. How many kilometers he pass in 8 hours?
3 trees in 3 lines grows in the orchard. How many trees are in the orchard?
I have 19 balls and my friend has 27. About how many has my friend more balls?
- Ton's teeth
Calculate at what age homeless Anton will toothless. At age 29 has 26 teeth and each year next one tooth broke.
Calculate how many hours take holidays, if take 5 weeks.
- Proof PT
Can you easy prove Pythagoras theorem using Euclidean theorems? If so, do it.
- 7 heroes
9 heroes galloping on 9 horses behind. How many ways can sort them behind?
In how many ways can 9 shuttle vans line up at the airport?
- Reverse Pythagorean theorem
Given are lengths of the sides of the triangles. Decide which one is rectangular: Δ ABC: 77 dm, 85 dm, 36 dm ? Δ DEF: 55 dm, 82 dm, 61 dm ? Δ GHI: 24 mm, 25 mm, 7 mm ? Δ JKL: 32 dm, 51 dm, 82 dm ? Δ MNO: 51 dm, 45 dm, 24 dm ?
- Is right?
Is triangle with sides 51, 56 and 77 right triangle?
A man bought a pig for € 60 then sold it for € 75. Then again bought for € 90 and sold it for € 100. How many € earned?
The root of the equation ? is: ?
Compare fractions ?. Which fraction of the lower?