Phần trăm có ở xung quanh chúng ta. Biết được chúng là gì, chúng có ý nghĩa như thế nào, và cách tính chúng ra sao rất hữu ích. Làm việc với chúng không khó như chúng ta tưởng, và hướng dẫn dưới đây có thể giúp bạn.
Tính Phần trăm của một Tổng
Biết được phần trăm là gì. Phần trăm là cách biểu diễn một số như một phần của một tổng. Để tính phần trăm, chúng ta coi tổng là 100%. Ví dụ, giả sử bạn có 10 quả táo (=100%). Nếu bạn ăn 2 quả, thì có nghĩa là bạn đã ăn 2/10 × 100% = 20% số quả táo bạn có và bạn còn lại 80% số quả táo ban đầu.- Thuật ngữ "percent" trong tiếng Anh có nguồn gốc từ tiếng Ý per cento hoặc tiếng Pháp pour cent, có nghĩa là per hundred (trên một trăm).
Xác định giá trị của tổng. Ví dụ, giả sử bạn có một cái bình chứa 1199 viên bi đỏ và 485 viên bi xanh, tổng cộng là 1684 viên bi. Trong trường hợp này, 1684 là tổng số bi trong bình, và được coi là 100%.
Tìm giá trị mà bạn muốn chuyển sang tỉ lệ phần trăm. Giả sử, chúng ta muốn tìm tỉ lệ phần trăm của phần bình bị chiếm chỗ bởi 485 viên bi xanh.
Đặt hai giá trị trên vào trong phân số. Trong ví dụ này, chúng ta cần tìm giá trị phần trăm của 485 (số viên bi xanh) trên 1684 (tổng số viên bi). Do đó phân số tạo thành sẽ là 485/1684.
Đổi phân số thành số thập phân. Để chuyển 485/1684 thành số thập phân, chia 485 cho 1684. Kết quả cho ra là 0,288.
Chuyển số thập phân thành phần trăm. Nhân kết quả thu được ở bước trên với 100. Trong ví dụ này, 0,288 nhân với 100 bằng 28,8 hay 28,8%.- Một cách đơn giản để nhân một số thập phân với 100 là di chuyển chữ số thập phân sang phải hai chữ số.
Tham khảo một số bài viết nổi bật:
https://linkhay.com/blog/57852/top-5-dich-vu-diet-gian-uy-tin-nhat-tai-tp-hcm
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https://enetget.com/post/831521_cu%E1%BB%99c-s%E1%BB%91ng-hi%E1%BB%87n-%C4%91%E1%BA%A1i-khi%E1%BA%BFn-chung-ta-ph%E1%BA%A3i-can-b%E1%BA%B1ng-gi%E1%BB%AFa-cu%E1%BB%99c-s%E1%BB%91ng-gia-%C4%91inh-va-s%E1%BB%B1-ng.html
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