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Friday, 09 January 2015 15:16

Apa kira-kira yang dipikirkan siswa sekolah dasar saat masuk pelajaran Matematika bab akar kuadrat? Banyak dari mereka yang mengaku kesulitan saat dipaksa mengerjakan soal tersebut secara manual dan tergiur untuk menggunakan cara instan dengan kalkulator. Sebenarnya, tanpa menggunakan kalkulator ada cara mudah yang bisa dilakukan. Berikut ulasannya.

1. Buat perkiraan angka depan dengan menguadratkan puluhan seperti berikut.

102 = 100 (1 berlaku untuk kisaran angka 100-400)
202 = 400 (2 berlaku untuk kisaran angka 400-900)
302 = 900 (3 berlaku untuk kisaran angka 900-1600)
402 = 1600 (4 berlaku untuk kisaran angka 1600-2500)
502 = 2500 (5 berlaku untuk kisaran angka 2500-3600)
602 = 3600 (6 berlaku untuk kisaran angka 3600-4900)
Dan seterusnya


2. Buat daftar kuadrat berikut dan hafalkan satuannya untuk menentukan satuan akhir pada hasil.

12 = 1 (satuannya 1)
22 = 4 (satuannya 4)
32 = 9 (satuannya 9)
42 = 16 (satuannya 6)
52 = 25 (satuannya 5)
62 = 36 (satuannya 6)
72 = 49 (satuannya 9)
82 = 64 (satuannya 4)
92 = 81 (satuannya 1)

Berapakah akar pangkat dua dari 3969? Angka 3969 berada pada kisaran 602 maka digunakan angka 6 sebagai angka depan. Untuk angka belakang perhatikan satuan dari angka 3969 yaitu 9. Maka angka belakang yang mungkin adalah 32 dan 72. Maka jawaban yang benar dari akar pangkat dua dari 3969 adalah di antara 63 dan 67. Setelah dicek menggunakan kuadrat maka 63 lah jawaban yang benar. Mudah bukan?

Sumber gambar : www.sydneytoday.com

[DS]

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