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NUMBER SYSTEMPROPERTIES OF NUMBERS
Odd and Even numbers and
Negative and Positive numbers Round and Compare numbers
Sequences or Patterns in a set of numbers
VOCABULARY
If that digit is less than 5, do not change the "rounding digit" but
change all digits to the right of the "rounding digit" to zero.
Operation Result
Example(red is odd, blue is
even)Even + Even Even 2 + 4 = 6
Even + Odd Odd 6 + 3 = 9
Odd + Even Odd 5 + 12 = 17
Odd + Odd Even 3 + 5 = 8
Adding and SubtractingWhen you add (or subtract) odd or even numbers the results are:(The same thing happens if you subtract instead
of adding)
MultiplyingWhen you multiply odd or even numbers the results are always:
Operation ResultExample
(red is odd, blue is even)
Even × Even Even 4 × 8 = 32
Even × Odd Even 4 × 7 = 28
Odd × Even Even 5 × 8 = 40
Odd × Odd Odd 5 × 7 = 35