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# Vertical Number Line-Bridge to 10 (Basic Subtraction)

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This vertical number line is used to help students visualize how to "Bridge to 10" or "Make a 10" when subtracting two 1 digit numbers.

The focus is finding the "difference" between 2 numbers as opposed to the idea of "taking away".

I printed this on colored paper and laminated them for my students to use with dry erase markers.

Example: 13 - 8 = ________

*Start at the smaller number (8) on the vertical number line. How many does it take to "Make a 10"? (Answer: 2). Write the number "2". Then students will analyze how many more it will take from 10 to get to the larger number-13 (3). Write the number "3". Then students will be able to see that the "gap or difference" between 8 and 13 is "2 + 3", which is equal to 5.

Prior Knowledge: Students must be able to quickly and accurately recognize buddy numbers that "make a 10".
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