By Gardner M.
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Additional resources for A Die of Another Color
A) Ϫ2 ϩ (Ϫ9) b) Ϫ48 ϩ (Ϫ67) Let’s review how to add numbers with different signs. 2 ϩ (Ϫ5) ϭ Ϫ3 Notice the use of parentheses when adding a negative number. and Ϫ8 ϩ 12 ϭ 4 Procedure Adding Numbers with Different Signs To add two numbers with different signs, find the absolute value of each number. Subtract the smaller absolute value from the larger. The sum will have the sign of the number with the larger absolute value. Let’s apply this to 2 ϩ (Ϫ5) and Ϫ8 ϩ 12. When adding numbers with different signs, the answer always has the sign of the number that is farthest from zero on the number line!
It is important to be able to approximate such square roots because sometimes it is necessary to estimate their places on a number line or on a Cartesian coordinate system when graphing. indd Page 23 01/11/12 5:38 PM user-f502 /207/MH01612/mes06279_disk1of1/0073406279/mes06279_pagefiles INTER— For the purposes of graphing, approximating a radical to the nearest tenth is sufficient. A calculator with a 1 key will give a better approximation of the radical. EXAMPLE 3 Find each square root, if possible.
Complete the given examples on your own. • Complete You Trys 1 and 2. 2 • Know what the 1 symbol represents and what Find Square Roots Ϫ1 represents. • Be able to identify the radicand and the type of solution you will obtain. • Complete the given example on your own. • Complete You Try 3. 3 • Memorize the Order of Operations. Write out the Use the Order of Operations procedure before you begin each problem. • Use a memory aid, such as Please Excuse My Dear Aunt Sally, to help you remember the steps.