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# 100-question Subtraction Random Test Generator

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100-question Subtraction Challenge Generator
The second event in the Math Olympics

Introduction
I made this exercise to encourage improved math operation calculation speed for first graders (specifically my daughter). It should be used after children are already comfortable with subtraction at a slower pace. I branded this activity an event in the Math Olympics to make it a fun challenge for kids.
The goal is to have students work up to completing all 100 questions in under five minutes. That works out to one question in three seconds or faster.

Background
I made this printout to help my seven-year-old daughter improve her subtraction speed. She was a generally-accurate-but-painfully-slow finger-counter, and I wanted her to move away from the theory of subtraction and towards the quick, practical application of operations in order to speed up her homework completion rate.

How to use the file
The printing format is already set up for you (print area has been defined). If you would like a new set of numbers randomly generated, simply press the F9 key. You can change the high and low number to change the range of random numbers generated (e.g. to make it easier or more challenging). I have made it so that no answers will be negative (it will only go to 0 as a possible answer).

Suggested Implementation
Children receive the paper with the problems face-down on the table. The teacher has a stopwatch prepared and says, “Go!” while starting the stopwatch. At the five-minute mark, pause the stopwatch and say, “Pause!” and have students mark their completed location in some way (I used a star in the top-left corner). Optionally, you can say, “Continue!” and resume the stopwatch, allowing the children to complete all 100 questions and logging their times.

Focus
There are two aspects of math operations being practiced—speed and accuracy.

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