성인의 수학 vs Sumday

어른을 위한 수능 수학 학습 앱. 학창 시절 멀어졌던 수학, 이제 내 속도로 다시 시작하세요. 시험 압박도, 등수도 없습니다. 오늘 한 문제면 충분해요. ■ 이렇게 공부해요 · 개념 카드로 핵심 공식을 먼저 가볍게 · 막히면 단계별 힌트 (정답은 가린 채 방향만) · 풀고 나면 바로 채점 + 해설 (자세한 풀이는 펼쳐보기) · 틀린 문제는 자동으로 ‘다시 풀 문제’에 모여요 ■ 수능 커리큘럼 그대로 중학 수학 · 고등 공통수학 · 수학Ⅰ · 수학Ⅱ · 확률과 통계 · 미적분 · 기하 과목 → 단원 → 세부 단원 → 난이도(개념확인~수능실전)로 차근차근. ■ 실전처럼, 모의수능 공통 + 선택 1과목으로 구성된 시간제한 모의고사. 원점수와 문항별 해설까지. 이미 푼 문제는 빼고 ‘안 풀어본 문제’ 위주로 출제돼요. ■ 꾸준함을 돕는 장치 · 출석 체크와 연속 학습일 · 매일 정해진 시간 학습 리마인더(선택) · 푼 문제 수·정답률·과목별 진행률 기록 지금, 오늘 한 문제부터.

Five minutes a day to get your mental math back. Sumday is a quiet daily routine for adults: real arithmetic, not puzzles, that keeps your number sense sharp. The more we rely on calculators and spreadsheets, the slower the math in our head gets. Sumday wakes it up with one short set a day that mixes addition, subtraction, multiplication, division, percentages and estimation. Learn one practical math trick a day, the kind school never taught you, and feel your speed come back. WHO IT'S FOR • Adults who feel their mental math isn't what it used to be • Anyone preparing for aptitude or job tests with timed number questions • People who want to split a bill, work out a discount or estimate a total in seconds • Anyone looking for light daily brain training HOW IT WORKS 1. Solve today's set of 20 questions. Five minutes is enough. 2. Check your results: accuracy and response time, compared with yesterday. 3. Unlock today's technique card and use it in tomorrow's set. 4. Come back tomorrow. A daily reminder keeps your streak going. FEATURES • Today's set: 20 mixed arithmetic questions across 7 types: addition, subtraction, multiplication, division, percentages, estimation and everyday math • Adaptive difficulty: questions get harder as you improve and ease off when you get stuck (12 levels) • Daily technique cards: 30 mental math tricks, from rounding shortcuts to quick percentages • Results report: accuracy, average response time and change since yesterday on one screen • Progress charts: daily and weekly trends in accuracy and speed • Streaks and a gentle daily reminder NO ACCOUNT, NO SERVER No sign-up needed. Your records stay on your device, and it works in airplane mode. PREMIUM (OPTIONAL) A one-time purchase removes ads and unlocks 3 practice modes (estimation, percentages, everyday math), Challenge mode (endless survival with 3 lives), Master mode (one life, every question timed), detailed statistics and all 30 technique cards. No subscription. Available in English, Korean and Japanese. Start your five minutes of math practice today.