Olimpiade Matematika untuk jenjang Sekolah Dasar (SD) kini menjadi ajang bergengsi yang dimulai sejak kelas awal. Bagi siswa kelas 1 yang tergabung dalam kelompok Topaz (biasanya menunjukkan level kemampuan tinggi atau kelompok unggulan), soal-soal yang diujikan tidak lagi sekadar berhitung. Soal-soal ini menguji logika, penalaran, pemecahan masalah, dan kemampuan berpikir cepat.
Artikel ini disusun khusus untuk menyediakan bank soal olimpiade matematika SD kelas 1 Topaz terbaru, lengkap dengan kunci jawaban dan pembahasan. Cocok untuk persiapan menuju KSN (Kompetisi Sains Nasional) tingkat kabupaten atau OSN tingkat dini.
If you have a specific school or region (e.g., "Topaz" might be from Primagama or BTA tutoring), let me know and I can narrow the search further.
Question D1
Rina has 7 apples. She gives 2 apples to Siti and then buys 3 more. How many apples does Rina have now?
Answer: 7 – 2 = 5; 5 + 3 = 8 soal olimpiade matematika sd kelas 1 topaz
Question D2
There are 18 students in Topaz class. 6 take the bus. 4 walk. The rest ride a bicycle. How many ride a bicycle?
Answer: 18 – (6+4) = 8
Question D3
My brother is 5 years old. I am 3 years older. My father is 30 years older than me. How old is father?
Answer: Me = 5+3=8; Father = 8+30=38
Question D4
A baker bakes 12 donuts in the morning and 15 in the afternoon. He sells 20. How many left?
Answer: 12+15=27; 27-20=7 Kumpulan Soal Olimpiade Matematika SD Kelas 1 Topaz:
Question D5
Arrange these numbers so that the sum of the first two equals the third: 2, 3, 5, 8
Answer: 2+3=5 and 3+5=8 (two possible)
Question D6
Lina’s house number is between 18 and 22. It is an odd number. What is it?
Answer: 19 or 21? Both. Have a single: If "the digits add to 10" – 19 (1+9=10). Let's use: between 18-22, odd, digits sum to 10 => 19.
Question D7
A snail climbs 3 meters up a wall each day but slips 2 meters each night. How many days to reach 5 meters?
Answer: Day1: 3-2=1m; Day2: 1+3-2=2m; Day3: 2+3=5m (reaches before slipping) → 3 days Kunci jawaban singkat
Question D8
In a line, Budi is 4th from the front and 7th from the back. How many children in line?
Answer: 4+7-1=10
Question D9
A pizza is cut into 6 slices. I eat 2 slices. My friend eats 1 slice. What fraction of pizza is left? (Fraction introduction for Topaz)
Answer: 3/6 or 1/2
Question D10
I think of a number. Add 5 → get 12. Subtract 3 → get 4. What number did I start with?
Answer: First clue: Number+5=12 → Number=7; Second clue: 7-3=4 (matches). So 7.