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The 4 is in the tens column so it's value is 4 x 10 = forty.
The value of 20 is 20. The value of 21 is 21. They can be combined in at least ten different ways that I can think of. Each method will result in a different value.
Guangdong
It means you replace each instance of the given variable with the given value. For instance, you have the following equation: A(A+2A)= B Then someone says to "substitute the value '4' for each instance of 'A'. You'd just replace them, and get: 4 ( 4 + 2(4)) = B
The value of a digit depends on its position as well as its face value.