STAR Mathematics 1 — Questions and Answers
Question 1: What is 456 + 789?
- 1,235
- 1,145
- 1,245 (Correct answer)
- 1,335
Correct answer: 1,245
To find the sum of 456 and 789, you perform standard addition. Adding the ones column (6+9=15), you write down 5 and carry over 1. Adding the tens column (5+8+1=14), you write down 4 and carry over 1. Adding the hundreds column (4+7+1=12), you write down 12. Combining these results gives the total sum of 1,245.
Question 2: If a rectangle has a length of 8 cm and a width of 5 cm, what is its area?
- 13 cm²
- 40 cm² (Correct answer)
- 26 cm²
- 64 cm²
Correct answer: 40 cm²
The area of a rectangle is calculated by multiplying its length by its width. In this problem, the length is 8 cm and the width is 5 cm. Therefore, the area is 8 cm multiplied by 5 cm, which equals 40 cm². The unit for area is always expressed in square units.
Question 3: Which of the following is equivalent to 3/4 as a decimal?
- 0.25
- 0.5
- 0.75 (Correct answer)
- 1.25
Correct answer: 0.75
To convert a fraction to a decimal, you divide the numerator by the denominator. For the fraction 3/4, you divide 3 by 4. Performing this division (3 ÷ 4) yields 0.75. This is a common fraction-to-decimal conversion often encountered in basic mathematics.
Question 4: A car travels 60 kilometers per hour. How far will it travel in 3 hours?
- 120 km
- 150 km
- 180 km (Correct answer)
- 200 km
Correct answer: 180 km
To calculate the total distance traveled, you multiply the speed by the time. The car travels at a speed of 60 kilometers per hour for 3 hours. Therefore, the distance is calculated as 60 km/hour multiplied by 3 hours, which equals 180 kilometers. This is a direct application of the distance = speed × time formula.
Question 5: What is the value of 7×(2+3)?
- 35 (Correct answer)
- 21
- 17
- 50
Correct answer: 35
To solve 7×(2+3), you must follow the order of operations (PEMDAS/BODMAS). First, calculate the expression inside the parentheses: 2 + 3 equals 5. Then, multiply this result by 7: 7 × 5 equals 35. Therefore, 35 is the correct value.
STAR Mathematics 1
What is 456 + 789?