This app can effectively strengthen subtraction, numeracy skills and working memory for confident students who would benefit from a challenge. Students can select from nine ranges of difficulty, starting with problems including numbers up to three all the way through multi-digit subtraction with numbers up to 100. Students will play rounds of matching games where they will need to match the equation to the answer or an equation of the same value. The ability to recognize equations of similar values, rather than simply solve an equation, is an important mathematical skill, but parents should anticipate that many students in the target age range may not be developmentally prepared and might be more comfortable with the flash card match only. Rounds start simply, with only four cards, and add cards as students progress. Students can add a layer of difficulty by having the cards turned face down as in typical memory games. However, solving and remembering multiple equations along with locations may be too taxing on working memory for all but the strongest students. The app has no timer and no negative feedback, nor does it enable adults to track students' play or progress. Overall, a fine subtraction practice app for strong math students who want to practice their numeracy and exercise working memory. *Note: This app was originally reviewed for iPhone/iPad. Some differences might apply.

• Provides sufficient and varied types of practice problems to maximize understanding and generalization of the targeted skill/concept
• Manufacturer claims alignment with Common Core/Known Standards
• Presents educational concepts accurately
• Explains answers so students can learn from mistakes
• Better for teaching the skill to new or struggling learners
• Better for practicing or refreshing the skill
• Skills are practiced through authentic, meaningful problems (not just rote practice)

• Appropriate for a broad age range to use and enjoy
• Subject matter and problems are relevant, interesting and authentic to students
• Visually appealing to children in the target age range
• Provides virtual rewards or incentives after meeting specified goals or objectives
• Provides a "break activity" between academic problem sets
• Offers ongoing, progressive challenge
• Overall - Enjoyable. Given the option, students would choose this option

• Has a free or trial version
• Provides teaching guidance for adults to support the child and set appropriate goals
• Provides an age-appropriate tutorial/first time users can work independently
• Student should be able to use independently after first use
• Has a multi-player option to foster in-person collaboration or cooperation
• Multiple users can save a profile
• Student graduates to the next level or topic only after meeting a benchmark
• Can play without sound and not distract others
• Students can save work between sessions
• Can effectively understand and monitor student's progress (email report or in product)
• Provides options to play in languages other than English/Good for ELL
• Presents information in multiple formats (voice over, pictures and text, etc.)
• Overall - Easy to use

• Attention
• Problems or examples are not interesting for the target age range
• Numerical Fluency
• Requires multi-step mental math
• Spatial Perception
• Requires scanning in multiple places for words, objects or numbers
• Requires remembering and completing a sequence of visual steps
• Visual Memory
• Requires remembering and completing a sequence of visual steps
• Working Memory
• Requires scanning in multiple places for words, objects or numbers
• Requires remembering and completing a sequence of visual steps
• Requires multi-step mental math