![]() ![]() About what low temperature would you expect Bangor to have on that day? The low temperature on one cold winter day in Boston was 3☏. Since the difference between 32.3 and 16.3 is 16, and |−32.3| > |16.3|, the correct answer is −16.īoston is, on average, 7 degrees warmer than Bangor, Maine. Then use the rules for adding two numbers with different signs. To subtract, change the problem to adding the opposite of −16.3, which gives −32.3 + 16.3. Since the difference between 32.3 and 16.3 is 16, and |−32.3| > |16.3|, the correct answer is −16. ![]() To subtract, change the problem to adding the opposite of −16.3, which gives Since the difference between 32.3 and 16.3 is 16, and |−32.3| > |16.3|, the correct answer is −16.Ĭorrect. Or, you could also rewrite it asģ8 + ( −23). You can subtract 38 – 23 just as you have always done. Note, that while this always works, whole number subtraction is still the same. To subtract a real number, you can rewrite the problem as adding the opposite (additive inverse). In the paired subtraction problem, you face the opposite direction and then move the same distance backward. In each addition problem, you face one direction and move some distance forward. Please make sure that Java 1.4.2 (or later) is installed and active in your browser ( Click here to install Java now) Sorry, the GeoGebra Applet could not be started. You will have to specify both numbers and whether you are adding or subtracting. Use the interactive number line below to find the answers to the following pairs of sums and differences, and compare the answers. īut isn’t this the same result as if you had added positive 3 to −2? −2 + 3 = 1. ![]() Then continue facing in a negative direction (to the left), but move backward to subtract −3. How do you subtract a negative number? First face and move forward in a negative direction to the first number, −2. Recall that when you add a negative number, you move forward, but face in a negative direction (to the left). Now let's see what this means when one or more of the numbers is negative. When you subtract positive numbers, you can imagine moving backward, but still facing in a positive direction. When you add positive numbers, you are moving forward, facing in a positive direction. When the greater number is positive, it's easy to see the connection. If you are adding two numbers with different signs, you find the difference between their absolute values and keep the sign of the number with the greater absolute value. You can use the additive inverses or opposites to rewrite subtraction as addition. ![]()
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