The easiest examples
- Three cats
If three cats eat three mice in three minutes, after which time 110 cats eat 110 mice?
Ricky bought 9 same chocolates for 9 Eur. How many euros he pay for 26 chocolates?
Is the number 146025 divisible by 6?
- One half
One half of ? is: ?
What is better for people (employees)? ?
One brick is 6 kg and half a brick heavy. What is the weight of one brick?
The parents had 7 daughters. Each of them had one brother. How many members family had?
9 trees in 5 lines grows in the orchard. How many trees are in the orchard?
A cyclist passes 88 km in 4 hours. How many kilometers he pass in 8 hours?
I have 19 balls and my friend has 27. About how many has my friend more balls?
- Proof PT
Can you easy prove Pythagoras theorem using Euclidean theorems? If so, do it.
- 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 ?
Calculate how many hours take holidays, if take 7 weeks.
- 7 heroes
5 heroes galloping on 5 horses behind. How many ways can sort them behind?
- Is right?
Is triangle with sides 51, 56 and 77 right triangle?
Compare fractions ?. Which fraction of the lower?
From which law follows directly the validity of Pythagoras' theorem in the right triangle? ?
- Ton's teeth
Calculate at what age homeless Anton will toothless. At age 29 has 26 teeth and each year next one tooth broke.
In how many ways can 5 shuttle vans line up at the airport?
Compare with characters >, <, =: 85.57 ? 80.83