8/11/2023 0 Comments Number line geometry![]() ![]() ![]() What happens if you do these subtraction problems on a number line? Explain your answers.Why does it make sense to walk forward for addition and walk backwards for subtraction? In what way is this the same as “combining” for addition and “take away” for subtraction”?.You can actually pace it out on a life-sized number line or draw a picture: Work out each of these exercises on a number line.Where he lands is the sum of the two numbers. Then he walks forward (to your right on the number line) the number of steps indicated by the second number (the second addend). If Zed wants to add two numbers, he walks forward (to the right of the number line) however many steps are indicated by the first number (the first addend). ![]() Then what he does depends on the calculation. When Zed wants to add or subtract with whole numbers on the number line, he always starts at 0 and faces the positive direction (towards 1). We’ll say that the distance Zed walks when he takes a step is exactly one unit. Imagine a person - we’ll call him Zed - who can stand on the number line. You can then assign numbers to other quantities based on how many of your basic unit fit inside.įor now, we’ll focus on the quantity length, and we’ll work with a number line where the basic unit is already marked off.Īddition and Subtraction on the Number Line The basic unit is a quantity - length, area, or volume - that you assign to the number one. In a measurement model, you have to pick a basic unit. Another way we often think about numbers is as abstract quantities that can be measured: length, area, and volume are all examples. ![]()
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