Math Olympiad

Question What is the value of $7 \times 8 + 6 \times 5$? tap to flip ↻ Answer $7 \times 8 = 56$, $6 \times 5 = 30$, so $56 + 30 = 86$. Question If a dozen is 12, how many items are in 5 dozen? tap to flip ↻ Answer $5 \times 12 = 60$ items. Question What is the next number in the pattern: 2, 6, 12, 20, 30, ___? tap to flip ↻ Answer 42. The differences are 4, 6, 8, 10, 12, so $30 + 12 = 42$. Question Which number is missing? $45 + \_\_ = 72$ tap to flip ↻ Answer $72 - 45 = 27$. Question What is the perimeter of a square with side length 9 cm? tap to flip ↻ Answer $4 \times 9 = 36$ cm. Question How many minutes are there in 2 hours and 15 minutes? tap to flip ↻ Answer $2 \times 60 + 15 = 135$ minutes. Question What is the place value of 7 in the number 4,782? tap to flip ↻ Answer 700 (seven hundreds). Question If you buy 3 pencils at 5 rupees each and pay with a 20-rupee note, how much change do you get? tap to flip ↻ Answer Cost = $3 \times 5 = 15$ rupees; change = $20 - 15 = 5$ rupees. Question What is the sum of the first 5 odd numbers? tap to flip ↻ Answer $1 + 3 + 5 + 7 + 9 = 25$. Question Which is greater: $\frac{3}{4}$ or $\frac{2}{3}$? tap to flip ↻ Answer $\frac{3}{4} = 0.75$, $\frac{2}{3} \approx 0.666$, so $\frac{3}{4}$ is greater. Question A rectangle has length 8 cm and width 5 cm. What is its area? tap to flip ↻ Answer $8 \times 5 = 40$ square cm. Question What is the value of $100 - 25 \times 2$? tap to flip ↻ Answer $25 \times 2 = 50$, then $100 - 50 = 50$. Question How many 25-paise coins make 5 rupees? tap to flip ↻ Answer 5 rupees = 500 paise; $500 \div 25 = 20$ coins. Question What is the next number in the pattern: 1, 4, 9, 16, 25, ___? tap to flip ↻ Answer 36. These are squares: $1^2, 2^2, 3^2, 4^2, 5^2, 6^2$. Question If today is Wednesday, what day will it be after 10 days? tap to flip ↻ Answer Saturday. 10 days = 1 week + 3 days; Wednesday + 3 days = Saturday. Question What is the smallest 3-digit number formed by digits 5, 0, 8 without repetition? tap to flip ↻ Answer 508. Arrange digits in ascending order, but 0 cannot be first. Question A dozen eggs cost 48 rupees. What is the cost of 1 egg? tap to flip ↻ Answer $48 \div 12 = 4$ rupees. Question What is the value of $6 \times (4 + 3)$? tap to flip ↻ Answer $4 + 3 = 7$, then $6 \times 7 = 42$. Question How many sides does a hexagon have? tap to flip ↻ Answer 6 sides. Question What is the sum of angles in a triangle? tap to flip ↻ Answer $180^\circ$.