점이 옮겨 가요
by Anonymous · ⭐ 1 · 🍴 0
✖️ 2.4 × 3 은 왜 7.2 일까요? 점을 빼고 24 × 3 = 72 를 구한 다음, 소수점 아래 자릿수만큼 다시 점을 찍으면 돼요. 두 수가 모두 소수면 자릿수를 «더해서» 찍습니다 — 0.6 × 0.7 이 0.42 인 까닭이 여기 있어요. 1보다 작은 수를 곱하면 오히려 작아지는 것도 직접 만들어 볼 수 있어요. ➗ 나누기 탭에서는 반대예요. 자연수로 나누면 소수점이 있던 자리 그대로 내려오고, 10으로 나누면 점이 왼쪽으로 한 칸 옮겨 갑니다. 🎯 마지막은 점을 뺀 숫자만 채우면 점은 앱이 찍어 줘요. 이 앱도 코드로 만들었어요 · 리믹스해서 100으로 나누기를 넣어 볼까요?
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About this app
The Point Moves is an interactive elementary math app for learning how decimal places behave during multiplication and division. Explore guided challenges that remove the decimal point, perform the calculation, and restore it by counting decimal places, then solve four practice problems by entering digits while the app places the point automatically. It also demonstrates why multiplying by a number less than 1 makes a value smaller and how division by 10 shifts the point left.
Use cases
- Elementary students learning decimal multiplication and division
- Teachers demonstrating decimal-place rules in class
- Parents practicing place value with children
- Learners reviewing how to divide by whole numbers and 10
Features
- Separate multiplication, division, and practice tabs
- Guided challenges with changeable decimal numbers and divisors
- Visual explanations for adding decimal places in multiplication
- Examples covering decimal × whole number, decimal × decimal, and division by 10
- Four digit-entry problems including 2.4 × 3, 0.6 × 0.7, 8.4 ÷ 4, and 3.5 ÷ 10
- Answer checking, reset and next controls, and optional sound