Hyakumon:＋－

"Hyakumon +-" is a 100-cell calculation app supports addition and subtraction.
It's easy, fun, and to improve children's fundamental mathematic capacity.

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What's 100-cell calculation?
10 random numbers are placed in the first row and in first column.
By calculating two numbers from the top and from the left 100 times, build fast and accurate calculation skill.

**Features**
You can choose following options in this app.
・The number of cells from 25 or 100.
・1 digit or 2 digits on addition mode.
・1 digit or 2 digits as minuend on subtraction mode.
・Repeat to calculate same numbers, or calculate random numbers each time.
Random numbers are placed in the first row and in the first column on random mode.
Two numbers are given so that the calculation result doesn't be negative on subtraction mode.
The calculation result includes 0.
A chart will appear after your exercise, will present time of excercise and the number of times of your mistakes.

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How to use:

1. Don't overdo at the beginning.
Don't warry about the time for exercise, even slowly, you should aim for finishing of all calculations accurately.
Set your target time based on your results of trying a couple of times.

2. Repeat the same exercise.
Repeat the same exercise every single day for 2 weeks.
By repeating, children will be able to calculate faster, and will have more confidence.

3. Check the results.
Check the result that exercising everyday make improve calculation skill.
When children finish the exercise, you should say to children "Well done!".
Don't upset if children take for a long time to finish the exercise.
You should cheer your children, say "you did well.".
Your recognition for their hard work will give peace of mind to children and will motivate them.

4. Romove the obstruction.
As you can figure out numbers that children took a long time to calculate and often mistook, you can teach children how to calculate of them.