![]() ![]() ![]() A decimal problem with negative numbers may look like this: -0.55 + 2.45 In order to complete this problem, you would follow the usual rules for adding a positive number to a negative number. I don't mention this in the lesson though, as the lesson is meant as introductory, and for 6th grade.)Īfter seeing those models/ways, we then proceed to solve some practice problems (additions and subtractions) using the shortcut. Negative decimals also work like whole positive and negative numbers but, as with fractions, they represent parts of numbers. (Of course, this shortcut is just a specific instance of the general principle that subtraction really is adding the opposite. If you are subtracting, move to the left of the number line If the signs are the. Examples include -100, 50, 8, 325 All of these numbers are all whole numbers. Negative numbers If you are adding, move to the right of the number line. What is an integer An integer is a whole number that can be negative or positive (but cannot be both at the same time). Use a set of rules to add and subtract integers. Students can review many concepts such as adding two negative numbers together, adding/subtracting positive and negative numbers, and subtracting two positive numbers to equal a negative number. Each way verifies (justifies) the SHORTCUT that subtracting a negative number is the same as ADDING a positive number: it is as if the two negatives − − turn into a positive +. /rebates/2fhotmath2fhotmathhelp2ftopics2fadding-and-subtracting-negatives&. Recognize the importance of integers in the real world. I show three models or ways to think about subtracting a negative integer: counters, number line jumps, and thinking about the distance between the numbers. Subtracting a negative integer: three models to justify the rule ![]()
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