The easiest examples
- Three cats
If three cats eat three mice in three minutes, after which time 210 cats eat 210 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: ?
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?
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?
9 trees in 2 lines grows in the orchard. How many trees are in the orchard?
- Proof PT
Can you easy prove Pythagoras theorem using Euclidean theorems? If so, do it.
Calculate how many hours take holidays, if take 7 weeks.
- Ton's teeth
Calculate at what age homeless Anton will toothless. At age 29 has 26 teeth and each year next one tooth broke.
- 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 ?
- 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?
- 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? ?
The root of the equation ? is: ?