Johnny is solving the multiplication problem 13.8 × 1.42 by multiplying longhand. Ignoring the decimal points, Johnny gets 19596, and now he must figure out where the decimal point goes. Johnny doesn’t yet know the rule about adding the number of places behind the decimal points in 13.8 and 1.42. Explain how Johnny can use reasoning about the sizes of the numbers to determine where the decimal point should go in his answer.

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A: Here if there is a problem like this, you should use different method as given below :

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.