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Practice
Multiplication Table
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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
5
6
2
0
Solution:
zero
Problem 2
If 5 is multiplied by an odd number, the last digit of the result is
0
5
2
1
Solution:
five
Problem 3
2 × 6 × 5 =
Solution:
60 because 2 × 6 × 5 = 2 × 5 × 6 = 10 × 6 = 60
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
5
8
6
Solution:
6
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
4
8
9
7
Solution:
9
Problem 6
What is the two-digit number whose sum of the digits is equal to their product?
Solution:
22 because 2 + 2 = 4 and 2 × 2 = 4
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?
Solution:
139 because 1 × 3 = 3 and 3 × 3 = 9
Problem 8
The width of a tablet is 3 inches and its length is 3 times greater. The perimetre is
Solution:
The lenght is 3 × 3 = 9 inches
Perimetre is 3 × 2 + 9 × 2 = 6 + 18 = 24 inches
Problem 9
The side of a square is 7 inches. Тhe square's perimetre is
Solution:
28 because the sides of a square are equal and 7 × 4 = 28
Problem 10
If we build a square from 9 squares whose sides are 3 inches, its perimetre will be
inches.
Solution:
The side of the square will be 3 × 3 = 9 inches.
Perimetre will be 9 × 4 = 36 inches
Problem 11
What is the area of a rectangle whose width is 2 metres and whose length is 4 times greater?
Solution:
The length is 2 × 4 = 8 metres
Area is 2 × 8 = 16 square metres
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