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The image you uploaded contains a mathematics test in Indonesian with various questions covering arithmetic, basic geometry, unit conversions, and other mathematical concepts. I will walk through the process of solving these problems, highlighting key areas.

### 1. Arithmetic and Basic Operations:
- **Q1 (77 + 26)** = 103
- **Q2 (454 + 891)** = 1345
- **Q3 (5742 + 3489)** = 9231
- **Q4 (37 - 43)** = -6
- **Q5 (664 - 278)** = 386
- **Q6 (3521 - 1987)** = 1534
- **Q7 (18 × 37)** = 666
- **Q8 (504 ÷ 8)** = 63
- **Q9 (931 ÷ 49)** = 19
- **Q10 (8 = 17 ?)**, likely a missing term in an equation (please clarify for more precise help).
- **Q11 (9 × ? = 63)**: ? = 7
- **Q12 (3x - 11 = ?)**, missing right-hand value (clarification needed).
- **Q13 (8 - 2 + 6)** = 12
- **Q14 (10 + 5 + 7)** = 22
- **Q15 (10 + 3 × 2)** = 16 (following order of operations).
  
### 2. Unit Conversions:
- **Q16 (12 cm = ? mm)**: 12 cm = 120 mm.
- **Q17 (9 m = ? cm)**: 9 m = 900 cm.
- **Q18 (6 km = ? m)**: 6 km = 6000 m.
- **Q19 (3 kg = ? g)**: 3 kg = 3000 g.
- **Q20 (7 t = ? kg)**: 7 t = 7000 kg.
- **Q21 (5 cc = ? ml)**: 5 cc = 5 ml (since 1 cc = 1 ml).
- **Q22 (8 ℓ = ? cc)**: 8 ℓ = 8000 cc (since 1 liter = 1000 cc).
- **Q23 (7 menit = ? detik)**: 7 minutes = 420 seconds.
- **Q24 (2.5 jam = ? menit)**: 2.5 hours = 150 minutes.
- **Q25 (180 menit = ? jam)**: 180 minutes = 3 hours.
  
### 3. Basic Arithmetic Expressions:
- **Q26 (√49)** = 7
- **Q27 (9)** = 9
- **Q28 (0.3 + 0.7)** = 1
- **Q29 (0.4 - 0.3)** = 0.1
- **Q30 (3.1 + 0.01)** = 3.11
- **Q31 (0.4 × 0.1)** = 0.04
- **Q32 (3 ÷ 12)** = 0.25
- **Q33 (⅓ + ⅕)** = 8/15
- **Q34 (50 × ⅗)** = 30
- **Q35 (2⅘ - 1⅕)** = 1⅗

### 4. Additional Questions:
- **Q36 (0.9 = ?)**: This needs clarification on what to solve.
- **Q37, Q38** are number sequences with missing terms.
- **Q39 (mean of 58, 9, 50)** = 39
- **Q40-Q42** (maximum, median, and minimum values are straightforward).
  
### 5. Geometry and Areas:
- **Q46 (Area of rectangle)** = 5 cm × 7 cm = 35 cm².
- **Q47 (Area of triangle)** = ½ × 7 cm × 4 cm = 14 cm².
- **Q48 (Area of circle with radius 4 cm)** = πr² = π(4)² = 16π ≈ 50.27 cm².
  
- **Q49 (Volume of cuboid 6×3×10 cm)** = 6 × 3 × 10 = 180 cm³.
- **Q50 (Circumference of circle with diameter 7 cm)** = πd = 7π ≈ 21.99 cm.

Would you like a deeper explanation for any of these problems or more details on a specific topic?

### 5 Related Questions:
1. What is the difference between mean, median, and mode?
2. How do you calculate the area of a triangle given the base and height?
3. Can you explain the order of operations for arithmetic expressions (PEMDAS)?
4. How are unit conversions between metric units done?
5. How do you find the volume of a rectangular prism?

**Tip:** For unit conversions, always remember that multiplying or dividing by powers of 10 (like 1000 for liters to milliliters) is key in metric systems.

The original question submitted by the user contains a mathematics test in Indonesian, covering arithmetic, geometry, and unit conversions.

Solve a variety of arithmetic operations, unit conversions, and geometry problems. This includes calculations of area, circumference, and volume, as well as understanding basic operations. Perfect for students in Grades 6-8 preparing for math assessments.

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