Your teacher can probably provide the correct answers once you have completed the Worksheet. The worksheet should tell you where to find the material in the question, or any practice
http://wiki.answers.com/Q/What_are_the_answers_to_...

Critical Thinking. Justifying mathematical answers requires critical thinking skills beyond solving a problem. Explaining the processes and procedures involved to reach the solution
http://www.ehow.com/info_8134492_justifyanswersm...

Which 'Maths Mate' are you using? New editions (2009) have different
http://www.chacha.com/question/whatistheanswer...

1 Addition: Even: If both addends are even. Odd: If one addend is even, and one is odd. Even: If both addends are odd. Ad 2 Subtraction Even: If both subtractends are even. Odd: If
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