Difficult

Multiplication Table: Very Difficult Problems with Solutions

By Catalin David
Problem 1
If five is multiplied by an even number, the last digit of the result is
Problem 2
If 5 is multiplied by an odd number, the last digit of the result is
Problem 3
2 × 6 × 5 =
Problem 4
If we multiply by 9 one specific number consisting of one digit unequal to 0 and the second digit of the result is 4, then the number is
Problem 5
If we multiply by 9 any number consisting of one digit unequal to 0, the sum of the digits of the result is
Problem 6
What is the two-digit number whose sum of the digits is equal to their product?
Problem 7
What is the three-digit number whose second digit is three times greater than the first and whose third digit is three times greater than the second?
Problem 8
The width of a tablet is 3 inches and its length is 3 times greater. The perimetre is
Problem 9
The side of a square is 7 inches. Тhe square's perimetre is
Problem 10
If we build a square from 9 squares whose sides are 3 inches, its perimetre will be inches.

Problem 11
What is the area of a rectangle whose width is 2 metres and whose length is 4 times greater?
Difficult
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