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::: A × (B + C) = (A × B) + (A × C).
Your child also encounters the applications of the principles of identity elements and the property of zero in multiplication. For example, zero is the identity element for addition; that is, zero plus a number equals that number. Similarly, this principle applies to multiplication. With multiplication, however, the number 1 is the identity element (one times a number equals that number). The· property of zero in multiplication-zero times a number is zero-is also presented.
The Laws of Arithmetic cartridge offers several special features that increase its motivational and reinforcement value:
* Colorful, rewarding graphics and sound effects that appear in response to correct answers.
* An unintimidating, try-again approach to incorrect answers.
* A progress report posted at the bottom of the screen.
* A feature that allows your child to study the answer to the problem if he or she makes a mistake.
* Advancement to the next level if problems are answered correctly, or automatic return to a lower level if your child needs more practice.
* Report screens personalized with your child's name at the end of each level's activities.
* An "Exit" screen with a complete report on your child's score at the end of the work session.
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