Addition and Subtraction 2

Many parents with kids in elementary school feel confident in their kids arithmetic however you may only be sure of this, when calculations become second nature. Talking about two-digit numbers calculations this means that child is able to answer within 4 to 9 seconds of the question being asked.

What we offer:
This app consists of 10 lessons; each of them intended to automate a particular calculation skill with two-digit numbers. Some lessons look very similar to each other but really do very different things.

How to use:
The pupil must correctly answer at least 95% of each lesson in the allowed time. The time allowed for each lesson is determined experimentally and is usually between 4 to 9 seconds. This feature may not be altered. The actual readiness is measured for the last 100 results. Once the pupil reaches 95% or more of correct results and the average time is equal or better than required, the lesson readiness becomes 100% and the lesson is marked as completed. At this time the lesson cannot be chosen for practice any more until the user resets the stats for the lesson or does a global stats reset. This way the pupil is not limited by any means and can continue learning anytime. Some pupils will require 200-300 practice problems to complete the lesson and others may require 3000-5000 for the same result. This is fine and nothing to worry about, as it may reflect the type of learner that the pupil is or the amount of initial knowledge on that subject.
Parents or teachers should keep track of the pupil’s stats from time to time. If there are many problems solved (few thousands for example) and the result do not show improvement, this is a sign that the pupil may require additional help. There are tips in Theory section which can help explain key points to the pupil. There are stats for last 10, 50, 100 problems solved and overall stats (calculated from the 95% of the best results). If you see that all stats are nearly the same (i.e. last ones are no better than overall) or worse than the required time or percentage of correct answers, this clearly means the pupil is experiencing difficulty and most likely will not progress without help.

Unfortunately, this app is not a magical way for knowledge to transfer over to the pupil. You won’t get any results just because you have installed it to your device. If you want to achieve excellent results is it advised to solve 200-300 problems a day.
Calculations with two-digit numbers up to 100. Do it automatically. Unbiased assessment of pupil’s necessary knowledge level.

I wish you and/or your child or pupils the best of luck in learning and I wish you to be a winner and be the best in everything you do :)