Page 20 - NUMINO Challenge_D1
P. 20
Basic Concepts Completing the Equation
When completing an equation by using numbers from 0 to 9 without
repetition, first write in the numbers that already have a fixed position.
There are several ways to make the following equations true.
369
817
4 5 20
Example Numbers from 1 to 9 are represented by the letters to . To
make the equations in the box true, find the value of the 2-digit
number that represents.
Class Notes
Since ,.
If the product of two identical factors is a 1-digit number, the only possible numbers are
1, 2, and 3. In the equation, . Therefore 2, is , or if 3,
is .
If 3 and , is a 2-digit number in the equation .
Therefore, 2 and , which means that .
In the equation , represents the 2-digit number 21. Hence, is
the only possible number for . Therefore, and .
In the equation , since and , is .
In the equation , and , and the remaining numbers are
5 and 9. Therefore and . .
The 2-digit number that represents is
17Number and Operations
When completing an equation by using numbers from 0 to 9 without
repetition, first write in the numbers that already have a fixed position.
There are several ways to make the following equations true.
369
817
4 5 20
Example Numbers from 1 to 9 are represented by the letters to . To
make the equations in the box true, find the value of the 2-digit
number that represents.
Class Notes
Since ,.
If the product of two identical factors is a 1-digit number, the only possible numbers are
1, 2, and 3. In the equation, . Therefore 2, is , or if 3,
is .
If 3 and , is a 2-digit number in the equation .
Therefore, 2 and , which means that .
In the equation , represents the 2-digit number 21. Hence, is
the only possible number for . Therefore, and .
In the equation , since and , is .
In the equation , and , and the remaining numbers are
5 and 9. Therefore and . .
The 2-digit number that represents is
17Number and Operations
