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Bilangan Practice Questions

UN (Indonesia) · UN Matematika · 132 free MCQs with instant results and detailed explanations.

132
Total
42
Easy
68
Medium
22
Hard

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Sample Questions from Bilangan

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Q1
Easy
What is the sum of the first five natural numbers?
A. 15
B. 10
C. 20
D. 25
Show Answer & Explanation
Correct Answer: A
The sum of the first five natural numbers (1 + 2 + 3 + 4 + 5) equals 15.
Q2
Easy
If a rectangle has a length of 8 cm and a width of 5 cm, what is its area?
A. 40 cm²
B. 30 cm²
C. 50 cm²
D. 60 cm²
Show Answer & Explanation
Correct Answer: A
The area of a rectangle is calculated by multiplying its length by its width (8 cm * 5 cm = 40 cm²).
Q3
Easy
Which of the following numbers is an even number?
A. 7
B. 10
C. 15
D. 21
Show Answer & Explanation
Correct Answer: B
An even number is divisible by 2 without a remainder. 10 is the only number here that meets this criterion.
Q4
Medium
If a number 'x' is increased by 25% and the result is 100, what is the original number 'x'?
A. 80
B. 75
C. 60
D. 50
Show Answer & Explanation
Correct Answer: A
If x is increased by 25%, it becomes 1.25x. Setting this equal to 100 gives 1.25x = 100, leading to x = 80.
Q5
Medium
What is the sum of the first 10 prime numbers?
A. 129
B. 100
C. 150
D. 200
Show Answer & Explanation
Correct Answer: A
The first 10 prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29. Their sum is 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 = 129.
Q6
Medium
A rectangle has a length of 10 cm and a width of 5 cm. What is the perimeter of the rectangle?
A. 30 cm
B. 25 cm
C. 20 cm
D. 15 cm
Show Answer & Explanation
Correct Answer: A
The perimeter of a rectangle is calculated using the formula P = 2(length + width). Here, P = 2(10 + 5) = 30 cm.
Q7
Medium
Which of the following numbers is a composite number?
A. 7
B. 13
C. 9
D. 17
Show Answer & Explanation
Correct Answer: C
A composite number has more than two distinct positive divisors. 9 has divisors 1, 3, and 9, making it composite, while the others are prime.
Q8
Hard
If the product of two consecutive integers is 272, what are the integers?
A. 16 and 17
B. 18 and 19
C. 12 and 13
D. 13 and 14
Show Answer & Explanation
Correct Answer: A
The product of two consecutive integers n and (n + 1) can be expressed as n(n + 1) = 272. Solving n^2 + n - 272 = 0 leads us to n = 16, giving us the integers 16 and 17.
Q9
Hard
A number is chosen randomly from the set of natural numbers less than 100. What is the probability that the chosen number is a multiple of both 3 and 5?
A. 0.2
B. 0.1
C. 0.3
D. 0.05
Show Answer & Explanation
Correct Answer: B
The multiples of both 3 and 5 are the multiples of 15. The multiples of 15 less than 100 are 15, 30, 45, 60, 75, and 90, totaling 6 numbers. Since there are 99 natural numbers below 100, the probability is 6/99, which simplifies to 0.1.
Q10
Hard
If x and y are two distinct prime numbers such that x + y = 30, what is the product of x and y?
A. 221
B. 209
C. 183
D. 195
Show Answer & Explanation
Correct Answer: A
The only pair of distinct prime numbers that add up to 30 is 13 and 17. Their product is 13 * 17 = 221. Other pairs do not yield distinct primes that sum to 30.

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Bilangan — UN (Indonesia) UN Matematika Practice Questions Online

This page contains 132 practice MCQs for the chapter Bilangan in UN (Indonesia) UN Matematika. The questions are organized by difficulty — 42 easy, 68 medium, 22 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.