Rules of arithmetic mc-TY-rules Evaluating expressions involving numbers is one of the basic tasks in arithmetic. But if an expression is complicated. If you are talking about multiplication and division of signed numbers the rules are. Positive x Positive = Positive Positive x Negative = Negative. Note we add the minus numbers,we add the plus numbers then tidy it up. Rule 3: Multiplication and signs: The basic rules for multiplication and signs are as. Resources By Grade Kindergarten 1st Grade 2nd Grade 3rd Grade 4th Grade 5th Grade 6th Grade 7th Grade 8th Grade Math Skills by State Online Resources Math Games Calculators Flash Cards Lessons Quizzes. How many jugs did Jan need? Because you now have negative numbers off to the left of zero, you also now have the "space" to complete this subtraction. Worksheets by Subject Printable worksheets are categorized under the subject headings below. Lowest common multiple LCM is another name for the smallest number that a given set of numbers will divide. You know now that the answer will be negative, because you're subtracting a bigger number than you'd started with the nine is bigger than the five. In general you will not be asked to put rational numbers on the number line. Note we add the minus numbers ,we add the plus numbers then tidy it up. Page 1 Page 2 Page 3 Page 4. The last two examples showed us that taking away balloons subtracting a positive or adding weights adding a negative both make the basket go down. Subtracting positive numbers is just simple subtraction. Printable multiplication tables in different formats and number ranges. When the signs are the same the answer is positive.