Lembar Kerja Siswa (LKS)

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Masalah 1.Tebakan Timbangan Kelereng

1. Koko dan Inem bermain tebak-tebakkan dengan menggunakan beberapa bungkus plastik hitam, beberapa buah kelereng, dan sebuah timbangan.

Koko memasukkan beberapa kelereng dalam jumlah sama ke dalam dua bungkus plastik, kemudian meletakkannya di atas sisi kanan timbangan yang sudah diletakkan pula 3 buah kelereng secara terpisah. Di sisi

kiri, Koko meletakkan sebuah bungkus plastik berisi kelereng yang jumlahnya sama dengan masing-masing plastik di sisi kanan. Agar seimbang, ternyata Koko perlu menambahkan 7 kelereng lagi di sisi kiri.Dari cerita di atas, diskusikan pertanyaan-pertanyaan berikut dan isikan jawabanmu di dalam kotak!a. Berapa banyak kelereng yang ada di dalam kantong tersebut?

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b. Jika di sebelah kiri ditambah 1 kantong lagi, maka berapa kelereng yang harus ditambahkan di sebelah kanan?

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c. Jika Koko mengambil 7 buah kelereng yang di sebelah kiri, berapa kelereng dan berapa kantong yang harus diambil di sebelah kiri agar timbangan tersebut seimbang.

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d. Bagaimana model matematika dari cerita di atas?

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Lembar Kerja Siswa (LKS)

Nama Kelompok : 1. _________________________________ 2. _________________________________ 3. _________________________________ 4. _________________________________ 5. _________________________________

Kelas : ___________________________________

Masalah 21. Suatu ketika Ricko dan Ayahnya bermain bola di taman depan

rumah mereka, mereka terlihat sangat bahagia. Saat Ricko dan Ayahnya bermain bola, Ricko mempunyai 2 kantong bola, masing-masing kantong isinya sama. Ayahnya memberi lagi 10 bola, ternyata banyak bola Ricko sekarang lebih dari 30 bola. Namun, disaat Ricko dan Ayahnya pulang, kantong bola Ricko tertinggal 1 kantong di taman tersebut.

Dari cerita di atas, diskusikan pertanyaan-pertanyaan berikut dan isikan jawabanmu di dalam kotak!

a. Berapakah banyak bola yang ada di dalam tiap-tiap kantong Ricko?

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b. Berapa jumlah bola Ricko sebelum Ricko diberi bola oleh Ayahnya?

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c. Jika Adik Ricko meminta bola Ricko sebanyak kurang dari 5 bola, berapa jumlah bola Ricko sekarang?

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d. Karena bola Ricko tertinggal di taman, maka jumlah bola Ricko sekarang adalah. . . .

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Lembar Kerja Siswa (LKS)

Nama Kelompok : 1. _________________________________ 2. _________________________________ 3. _________________________________ 4. _________________________________ 5. _________________________________

Kelas : ___________________________________

Masalah 31.

Dua ekor katak, Komo dan Dodo, sedang dikejar oleh seekor ulat yang hendak memangsa mereka. Pada saat mulai dikejar, Komo berada 3 meter di depan ular, sedangkan Dodo berada 1 meter di belakang Komo. Mengetahui mereka sedang dalam bahaya, kedua katak itu melompat menjauh dari ular. Komo melompat sebanyak 12 kali dan Dodo melompat 17 kali sebelum akhirnya mereka bertemu di titik yang sama dan akhirnya ular itu pergi.a. Jika masing-masing jarak setiap lompatan kedua katak tersebut sama, berapakah jarak setiap

lompatan tersebut?

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b. Jika ular itu berhasil menangkap mereka, berapa jarak yang ditempuh ular tersebut selama pengejaran?

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c. Jika ular itu tidak berhasil menangkap mereka, berapa jarak yang ditempuh ular tersebut selama pengejaran?

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d. Jika lompatan yang dilakukan oleh Komo sama dengan Dodo, apakah mereka akan bertemu disatu titik?

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