MENU
❌
Home
Math Forum/Help
Problem Solver
Practice
Worksheets
Tests
Algebra
Geometry
College Math
History
Games
MAIN MENU
1 Grade
Adding and subtracting up to 10
Comparing numbers up to 10
Adding and subtracting up to 20
Addition and Subtraction within 20
2 Grade
Adding and Subtracting up to 100
Addition and Subtraction within 20
3 Grade
Addition and Subtraction within 1000
Multiplication up to 5
Multiplication Table
Dividing
Rounding
Addition, Multiplication, Division
Perimeter
4 Grade
Adding and Subtracting
Addition, Multiplication, Division
Equivalent Fractions
Divisibility by 2, 3, 4, 5, 9
Area of Squares and Rectangles
Fractions
Equivalent Fractions
Least Common Multiple
Adding and Subtracting
Fraction Multiplication and Division
Operations
Mixed Numbers
Decimals
Expressions
6 Grade
Percents
Signed Numbers
The Coordinate Plane
Equations
Expressions
Polynomials
Polynomial Vocabulary
Symplifying Expressions
Polynomial Expressions
Factoring
7 Grade
Angles
Inequalities
Linear Functions
8 Grade
Congurence of Triangles
Linear Functions
Systems of equations
Slope
Parametric Linear Equations
Word Problems
Exponents
Roots
Quadratic Equations
Quadratic Inequalities
Rational Inequalities
Vieta's Formulas
Progressions
Arithmetic Progressions
Geometric Progression
Progressions
Number Sequences
Reciprocal Equations
Logarithms
Logarithmic Expressions
Logarithmic Equations
Logarithmic Equations
Logarithmic Inequalities
Irrational Equations
Irrational Inequalities
Trigonometry
Trigonometry
Identities
Trigonometry
Trigonometric Equations
Trigonometric Inequalities
Extremal value problems
Numbers Classification
Geometry
Intercept Theorem
Slope
Law of Sines
Law of Cosines
Vectors
Modulus Inequalities
Exponential Inequalities
Exponential Equations
Modulus equations
Probabilities
Functions
Min, Max Values
Limits
Limits of Functions
Monotonicity of Functions
Properties of Triangles
Pythagorean Theorem
Matrices
Complex Numbers
Inverse Trigonometric Functions
Analytic Geometry
Analytic Geometry
Circle
Parabola
Ellipse
Conic sections
Polar coordinates
Derivatives
Derivatives
Applications of Derivatives
Derivatives
Integrals
Integrals
Integration by Parts
Trigonometric Substitutions
Application
Differential Equations
Home
Practice
Multiplication Table
Easy
Normal
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
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
Easy
Normal
Difficult
Submit a problem on this page.
Problem text:
Solution:
Answer:
Your name(if you would like to be published):
E-mail(you will be notified when the problem is published)
Notes
: use [tex][/tex] (as in the forum if you would like to use latex).
Correct:
Wrong:
Unsolved problems:
Feedback
Contact email:
Follow us on
Twitter
Facebook
Copyright © 2005 - 2024.